diff --git a/mapgen.lua b/mapgen.lua
index 41b8453..982e75e 100644
--- a/mapgen.lua
+++ b/mapgen.lua
@@ -113,7 +113,7 @@ override_underground_biomes()
 
 -- nether:native_mapgen is used to prevent ores and decorations being generated according
 -- to landforms created by the native mapgen.
--- Ores and decorations are registered against "nether:rack" instead, and the lua
+-- Ores and decorations can be registered against "nether:rack" instead, and the lua
 -- on_generate() callback will carve the Nether with nether:rack before invoking
 -- generate_decorations and generate_ores.
 minetest.register_node("nether:native_mapgen", {})
@@ -160,7 +160,7 @@ minetest.register_ore({
 	ore_type       = "scatter",
 	ore            = "default:lava_source",
 	wherein        = "nether:rack",
-	clust_scarcity = 32 * 32 * 32,
+	clust_scarcity = 36 * 36 * 36,
 	clust_num_ores = 4,
 	clust_size     = 2,
 	y_max = NETHER_CEILING,
diff --git a/mapgen_decorations.lua b/mapgen_decorations.lua
index b210db8..5b7d7e3 100644
--- a/mapgen_decorations.lua
+++ b/mapgen_decorations.lua
@@ -113,7 +113,7 @@ minetest.register_decoration({
     deco_type = "schematic",
     place_on = "nether:rack",
     sidelen = 80,
-    fill_ratio = 0.0004,
+    fill_ratio = 0.0003,
     biomes = {"nether_caverns"},
     y_max = nether.DEPTH_CEILING, -- keep compatibility with mapgen_nobiomes.lua
     y_min = nether.DEPTH_FLOOR,
@@ -127,7 +127,7 @@ minetest.register_decoration({
     deco_type = "schematic",
     place_on = "nether:rack",
     sidelen = 80,
-    fill_ratio = 0.0007,
+    fill_ratio = 0.0008,
     biomes = {"nether_caverns"},
     y_max = nether.DEPTH_CEILING, -- keep compatibility with mapgen_nobiomes.lua
     y_min = nether.DEPTH_FLOOR,