So I'm wondering if I lower my truck just slightly.. Maybe an inch drop front with back leveled to that If it'd hurt my driving capabilities, or "truck use" lol

 

all its going to do is reduce your clearance up front. in the rear if you just use shackles, it will technically reduce your load capacity only because it will be less travel before you hit the bump stops. but if you air bags or air shocks on there you will gain this capacity back.
shackles dont change the spring rate at all, they only move the spring/axle assemble closer to the frame.

 

i leveled the back of my truck and i pull a 5000 pound lawn trailer and it is very close to the wheels, i also have 26's tho. i will be getting the helper bags when summer rolls around again.