correct offset for 19" te37

Wassup everybody. I just purchased a 2013 regular cab base model and want to put 19"x9.5, 19"x10.5 te37 rims on my truck. I will be lowering it 3"-4" in the front using DJM upper/lower control arms and maybe a drop spring and 3" in the rear with a block and QA1 struts. I want to know what offset should I use to get the rim flush with the fenders. I've seen guys with x-runners running either +12 or +22 offsets but of course they have the fender flares. A shop I wanted to order from said the rims would stick out from my fenders with these offsets. Any help would be appreciated.