diff --git a/mods/MAPGEN/mcl_structures/desert_temple.lua b/mods/MAPGEN/mcl_structures/desert_temple.lua
index bb4c08b3a..eb1950b18 100644
--- a/mods/MAPGEN/mcl_structures/desert_temple.lua
+++ b/mods/MAPGEN/mcl_structures/desert_temple.lua
@@ -5,7 +5,7 @@ local chance_per_chunk = 11
 local noise_multiplier = 1
 local random_offset    = 999
 local scanning_ratio   = 0.00003
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
 
diff --git a/mods/MAPGEN/mcl_structures/desert_well.lua b/mods/MAPGEN/mcl_structures/desert_well.lua
index af57c8183..1bd6691d2 100644
--- a/mods/MAPGEN/mcl_structures/desert_well.lua
+++ b/mods/MAPGEN/mcl_structures/desert_well.lua
@@ -1,11 +1,11 @@
 local modname = minetest.get_current_modname()
 local modpath = minetest.get_modpath(modname)
 
-local chance_per_chunk = 60
+local chance_per_chunk = 40
 local noise_multiplier = 1
 local random_offset    = 999
 local scanning_ratio   = 0.00001
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
 
diff --git a/mods/MAPGEN/mcl_structures/fossil.lua b/mods/MAPGEN/mcl_structures/fossil.lua
index b26b7320a..6c6c2d24b 100644
--- a/mods/MAPGEN/mcl_structures/fossil.lua
+++ b/mods/MAPGEN/mcl_structures/fossil.lua
@@ -4,7 +4,7 @@ local modpath = minetest.get_modpath(modname)
 local chance_per_block = mcl_structures.from_16x16_to_block_inverted_chance(64)
 local noise_multiplier = 2
 local random_offset    = 5
-local struct_threshold = chance_per_block - 1
+local struct_threshold = chance_per_block
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
 local minetest_find_nodes_in_area = minetest.find_nodes_in_area
 local min_y = mcl_worlds.layer_to_y(40)
diff --git a/mods/MAPGEN/mcl_structures/ice_spike_small.lua b/mods/MAPGEN/mcl_structures/ice_spike_small.lua
index 801c5f66e..387c61bab 100644
--- a/mods/MAPGEN/mcl_structures/ice_spike_small.lua
+++ b/mods/MAPGEN/mcl_structures/ice_spike_small.lua
@@ -3,7 +3,7 @@ local modpath = minetest.get_modpath(modname)
 
 local chance_per_chunk = 3
 local random_offset    = 1264
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 local noise_params = {
 	offset = 0,
 	scale  = 1,
diff --git a/mods/MAPGEN/mcl_structures/igloo.lua b/mods/MAPGEN/mcl_structures/igloo.lua
index 4f6c9574f..ebb88667b 100644
--- a/mods/MAPGEN/mcl_structures/igloo.lua
+++ b/mods/MAPGEN/mcl_structures/igloo.lua
@@ -1,11 +1,10 @@
 local modname = minetest.get_current_modname()
 local modpath = minetest.get_modpath(modname)
 
--- local chance_per_chunk = mcl_structures.from_16x16_to_chunk_inverted_chance(4400)
-local chance_per_chunk = 100
+local chance_per_chunk = 39
 local noise_multiplier = 1.4
 local random_offset    = 555
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 local scanning_ratio   = 0.0003
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
diff --git a/mods/MAPGEN/mcl_structures/jungle_temple.lua b/mods/MAPGEN/mcl_structures/jungle_temple.lua
index 635f35670..9abaf4626 100644
--- a/mods/MAPGEN/mcl_structures/jungle_temple.lua
+++ b/mods/MAPGEN/mcl_structures/jungle_temple.lua
@@ -1,10 +1,10 @@
 local modname = minetest.get_current_modname()
 local modpath = minetest.get_modpath(modname)
 
-local chance_per_chunk = 9
+local chance_per_chunk = 30
 local noise_multiplier = 1.3
 local random_offset    = 132
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 local scanning_ratio   = 0.0003
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
diff --git a/mods/MAPGEN/mcl_structures/nice_jungle_temple.lua b/mods/MAPGEN/mcl_structures/nice_jungle_temple.lua
index dd8df05d3..75a137b03 100644
--- a/mods/MAPGEN/mcl_structures/nice_jungle_temple.lua
+++ b/mods/MAPGEN/mcl_structures/nice_jungle_temple.lua
@@ -1,10 +1,10 @@
 local modname = minetest.get_current_modname()
 local modpath = minetest.get_modpath(modname)
 
-local chance_per_chunk = 15
+local chance_per_chunk = 40
 local noise_multiplier = 1
 local random_offset    = 133
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 local scanning_ratio   = 0.00021
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
 
diff --git a/mods/MAPGEN/mcl_structures/witch_hut.lua b/mods/MAPGEN/mcl_structures/witch_hut.lua
index f6dc6ec9b..49843bb59 100644
--- a/mods/MAPGEN/mcl_structures/witch_hut.lua
+++ b/mods/MAPGEN/mcl_structures/witch_hut.lua
@@ -1,11 +1,11 @@
 local modname = minetest.get_current_modname()
 local modpath = minetest.get_modpath(modname)
 
-local chance_per_chunk = 3
+local chance_per_chunk = 17
 local noise_multiplier = -0.9
 local random_offset    = 8
 local scanning_ratio   = 0.01
-local struct_threshold = chance_per_chunk - 1
+local struct_threshold = chance_per_chunk
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
 
diff --git a/mods/MAPGEN/mcl_villages/init.lua b/mods/MAPGEN/mcl_villages/init.lua
index 92af69e76..4a5da47bf 100644
--- a/mods/MAPGEN/mcl_villages/init.lua
+++ b/mods/MAPGEN/mcl_villages/init.lua
@@ -1,9 +1,9 @@
 mcl_villages                     = {}
+local chance_per_chunk           = 100
 local chunk_offset_top           = 16
 local chunk_offset_bottom        = 3
 local max_height_difference      = 12
 local minp_min                   = -64
-local chance_per_chunk           = 1
 local noise_multiplier           = 1
 local random_offset              = 1
 local random_multiply            = 19