I'm a little late, but have to agree with the other guys. Try some different shocks, but I'm guessing you'll still have some rubbing with the wheel/tire combo you have. I'd say the only way to avoid any rubbing is to roll the fenders, mod the liners.
I just put on a set of the OEM srt 10 night runner wheels that are 22x10 with Nitto 305/45-22's. I have a 3/5 drop and have to say that these don't rub a much as the factory 20's with 275/55-20 tires. I know it sounds odd--believe me I was surprised as well. I had already ordered a set of Nitto 285/45-22's from discount tire. I figured I'd try the 305's out 1st, seeing as how they were already on the wheels.
There is very little gap from the top of the tire to the wheel well, but I've not rubbed the lip of the fender as much as I expected. I will likely put the other tires on, but for now I'm riding on the factory SRT size.
I do expect to roll the fender soon and mod my liners, just to avoid any rubbing. Maybe I'll do that when I get my C-Notch done.