since your pack is so awesome already, i'm not even going to pretend i can help with the design or theme. So i thought about it, and i came up with some stats for weapons.
***Grief-blower/Griefblower***
-30% airblast cost
-10% primary ammo
airblast can rapid fire
stream of fire is thinner

***Head-Trimmer***
Longer melee range
+20% damage
+35% attack speed

Is it okay to call it the "horticultural horror" pack?
-20% damage from environmental sources