diff --git a/gm4_desire_lines/data/gm4_desire_lines/function/init.mcfunction b/gm4_desire_lines/data/gm4_desire_lines/function/init.mcfunction
index 1cfbfa707d..aafae3023a 100644
--- a/gm4_desire_lines/data/gm4_desire_lines/function/init.mcfunction
+++ b/gm4_desire_lines/data/gm4_desire_lines/function/init.mcfunction
@@ -4,8 +4,14 @@ scoreboard objectives add gm4_dl_affcoarse dummy
 # constants
 scoreboard players set #base_probability gm4_desire_lines 1
 scoreboard players set #sneak_penality gm4_desire_lines -5
-scoreboard players set #sprint_penalty gm4_desire_lines 3
-scoreboard players set #impact_penalty gm4_desire_lines 8
+scoreboard players set #sprint_penalty gm4_desire_lines 1
+scoreboard players set #impact_penalty gm4_desire_lines 31
+
+# considerations
+# walking speed = 4.317 blocks/s ~ 4.63 ticks / block
+# sprinting speed = 5.612 blocks/s ~ 3.56 ticks / block
+# walking ~ 1 - (0.99)^4.63 = 0.045 ~ 5% chance to convert each block
+# sprinting ~ 1 - (0.98)^3.56 = 0.069 ~ 7% chance to convert each block
 
 execute unless score desire_lines gm4_modules matches 1 run data modify storage gm4:log queue append value {type:"install",module:"Desire Lines"}
 execute unless score desire_lines gm4_earliest_version < desire_lines gm4_modules run scoreboard players operation desire_lines gm4_earliest_version = desire_lines gm4_modules
diff --git a/gm4_desire_lines/data/gm4_desire_lines/function/path.mcfunction b/gm4_desire_lines/data/gm4_desire_lines/function/path.mcfunction
index d68cd3852a..20ed6d8ef4 100644
--- a/gm4_desire_lines/data/gm4_desire_lines/function/path.mcfunction
+++ b/gm4_desire_lines/data/gm4_desire_lines/function/path.mcfunction
@@ -4,7 +4,7 @@
 # run from player
 
 # check blocks
-fill ~ ~-0.06 ~ ~ ~-0.06 ~ coarse_dirt replace dirt
+execute positioned ~ ~-0.06 ~ if predicate gm4_desire_lines:can_coarse_dirt run fill ~ ~ ~ ~ ~ ~ coarse_dirt replace dirt
 fill ~ ~-0.06 ~ ~ ~-0.06 ~ dirt replace grass_block
 fill ~ ~ ~ ~ ~ ~ air replace snow[layers=1]
 fill ~ ~ ~ ~ ~ ~ snow[layers=1] replace snow[layers=2]
@@ -13,8 +13,8 @@ fill ~ ~-0.06 ~ ~ ~-0.06 ~ frosted_ice[age=3] replace frosted_ice[age=2]
 fill ~ ~-0.06 ~ ~ ~-0.06 ~ frosted_ice[age=2] replace frosted_ice[age=1]
 fill ~ ~-0.06 ~ ~ ~-0.06 ~ frosted_ice[age=1] replace frosted_ice[age=0]
 
-# remove foliage
-execute if block ~ ~ ~ #gm4:foliage unless block ~ ~ ~ moss_carpet run setblock ~ ~ ~ air destroy
+# remove foliage if coarse dirt
+execute if block ~ ~-0.07 ~ coarse_dirt if block ~ ~ ~ #gm4:foliage unless block ~ ~ ~ moss_carpet run setblock ~ ~ ~ air destroy
 
 # advancement check
 execute if block ~ ~-0.07 ~ coarse_dirt run scoreboard players add @s gm4_dl_affcoarse 1
diff --git a/gm4_desire_lines/data/gm4_desire_lines/predicate/can_coarse_dirt.json b/gm4_desire_lines/data/gm4_desire_lines/predicate/can_coarse_dirt.json
new file mode 100644
index 0000000000..a9a1718c7e
--- /dev/null
+++ b/gm4_desire_lines/data/gm4_desire_lines/predicate/can_coarse_dirt.json
@@ -0,0 +1,41 @@
+{
+    "condition": "minecraft:any_of",
+    "terms": [
+        {
+            "condition": "minecraft:location_check",
+            "offsetX": 1,
+            "predicate": {
+                "block": {
+                    "blocks": "#dirt"
+                }
+            }
+        },
+        {
+            "condition": "minecraft:location_check",
+            "offsetX": -1,
+            "predicate": {
+                "block": {
+                    "blocks": "#dirt"
+                }
+            }
+        },
+        {
+            "condition": "minecraft:location_check",
+            "offsetZ": 1,
+            "predicate": {
+                "block": {
+                    "blocks": "#dirt"
+                }
+            }
+        },
+        {
+            "condition": "minecraft:location_check",
+            "offsetZ": -1,
+            "predicate": {
+                "block": {
+                    "blocks": "#dirt"
+                }
+            }
+        }
+    ]
+}