diff --git a/mods/MAPGEN/mcl_structures/desert_temple.lua b/mods/MAPGEN/mcl_structures/desert_temple.lua
index e35880ab2..798ac9077 100644
--- a/mods/MAPGEN/mcl_structures/desert_temple.lua
+++ b/mods/MAPGEN/mcl_structures/desert_temple.lua
@@ -3,11 +3,11 @@ local modpath = minetest.get_modpath(modname)
 
 -- Check: v7 apple -21539,27,2404
 
-local chance_per_chunk = 11
-local noise_multiplier = 1
+local chance_per_chunk = 32
+local noise_multiplier = 0.9
 local random_offset    = 999
 local scanning_ratio   = 0.0003
-local struct_threshold = chance_per_chunk
+local struct_threshold = chance_per_chunk - 1
 
 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 83ab3f14f..81119452e 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 = 20
+local chance_per_chunk = 40
 local noise_multiplier = 1
 local random_offset    = 999
 local scanning_ratio   = 0.0002
-local struct_threshold = chance_per_chunk
+local struct_threshold = chance_per_chunk - 1
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
 
diff --git a/mods/MAPGEN/mcl_structures/igloo.lua b/mods/MAPGEN/mcl_structures/igloo.lua
index 42f434a9a..930e29787 100644
--- a/mods/MAPGEN/mcl_structures/igloo.lua
+++ b/mods/MAPGEN/mcl_structures/igloo.lua
@@ -4,9 +4,9 @@ local modpath = minetest.get_modpath(modname)
 -- Check: v7 apple -27787,31,3115
 
 local chance_per_chunk = 39
-local noise_multiplier = 1.4
+local noise_multiplier = 1.3
 local random_offset    = 555
-local struct_threshold = chance_per_chunk
+local struct_threshold = chance_per_chunk - 1
 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 f6edd9891..4e97398e5 100644
--- a/mods/MAPGEN/mcl_structures/jungle_temple.lua
+++ b/mods/MAPGEN/mcl_structures/jungle_temple.lua
@@ -4,10 +4,10 @@ local modpath = minetest.get_modpath(modname)
 -- Check: v7 apple 28530,6,28070
 -- Check: v7 apple -16343,24,5330
 
-local chance_per_chunk = 30
+local chance_per_chunk = 50
 local noise_multiplier = 1.3
 local random_offset    = 132
-local struct_threshold = chance_per_chunk
+local struct_threshold = chance_per_chunk - 1
 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 a301d491b..a229fe251 100644
--- a/mods/MAPGEN/mcl_structures/nice_jungle_temple.lua
+++ b/mods/MAPGEN/mcl_structures/nice_jungle_temple.lua
@@ -4,10 +4,10 @@ local modpath = minetest.get_modpath(modname)
 -- Check: v7 apple 27576,14,28368
 -- Check: v7 apple 29570,10,29266
 
-local chance_per_chunk = 40
+local chance_per_chunk = 70
 local noise_multiplier = 1
 local random_offset    = 133
-local struct_threshold = chance_per_chunk
+local struct_threshold = chance_per_chunk - 1
 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 72b3c4852..c5a683ce5 100644
--- a/mods/MAPGEN/mcl_structures/witch_hut.lua
+++ b/mods/MAPGEN/mcl_structures/witch_hut.lua
@@ -5,11 +5,11 @@ local modpath = minetest.get_modpath(modname)
 -- Check: v7 apple 2637,6,-12031
 -- Check: v7 apple 2644,6,-17968
 
-local chance_per_chunk = 17
+local chance_per_chunk = 34
 local noise_multiplier = -0.9
 local random_offset    = 8
 local scanning_ratio   = 0.01
-local struct_threshold = chance_per_chunk
+local struct_threshold = chance_per_chunk - 1
 
 local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level