Lifesteal heals damage times lifesteal. even a weapon with a lifesteal of 2 is broken as it heals 2 times what you deal. You also can't put decimals in the config so i could not fix this with the config.

https://github.com/spoorn/SpoornWeaponAttributes/blob/main/src/main/java/org/spoorn/spoornweaponattributes/mixin/PlayerEntityMixin.java
^ Line 190, should be divided by 100.