No way you're going to level without impacting the ride. I have my RC keys cranked, and more than they should be for sure, probably right about 2.75". My truck, same style as yours, rides like shit. I got used to it, but on those bigger bumps I'm still dropping a few F-bombs when I hit them.
Also, I don't think you'll fit that 305 even if you max crank. It may "fit", with some trimming, but it still may not have full articulation and when you hit a bump it could jam in the wheel well...not get stuck, but it could hit pretty hard.
This is where you need to think about what you want, and what you're willing to accept. What you want, is just big enough for a certain look...what you need to get that look is a full lift, at least 4" with a diff drop.
Not what you want to hear, but I've been there and I wished I lifted years ago...