With my 2 chars i found it's damn boring to craft Rot Guts one by one. See, you gather wood to max capacity, then go for fruits 'till 21-22 min gathering, and go with all of that to still. Then u spend like 5-10 minutes on crafting rot guts, i do that every day, it's pain, annoying and boring.
Molotov takes 5 rot guts
Flamethrower Fuel takes 2 rot guts
I'v never craft one, two or three rot guts, always like 10-20-30, it's time time saving.
My suggestion is to raise number of crafter rot guts and ingredients. From 1 wood, 2 fruits = 2 rot guts, to 5 wood + 10 fruits = 10 rot guts.