Okay, I looked into it and there was a bug. My mod does actually increase the amount of mobs on screen when using battle potion, but it was multiplying it by 10 no matter what you set "BattlePotionMultiplier" to in the configuration file. I fixed it, so if you want battle potion to boost it like it does in vanilla, then set it to 1. I'll add a configuration option for Pyscho Knifes. EDIT: Okay, the configuration option for Pyscho Knifes is added.