I think your truck looks great like that. I don't see the need for abody lift to clear 33's. If you look into some of the quality builds here most guys really tried to avoid this. Many just used a 1/2" for 33" and some an 1" for 35's as a last resort. We all have our favorite builds but I built my truck basing it off a few of the veterans experiences here. The majority of your rubbing should be on the rear of the drivers front fender. Some trimming and pw hammering should do the trick. I rub there on my limited flare now when turning bc my spacers are back on, but only in extreme flex. But that's when I'm actually wheeling. Driving around on dirt roads looking for a rock to park on for a picture is not wheeling. A body lift will obv create gap between your stock bumpers. And be aware that once you get 33's and a few more parts, no one that struggles to have 35's on their truck is going to go any farther than you.
I don't know how a body lit can gain you an clearance or save your rocker panels. I think the sliders are for that and my skid plates would hit before the body ever did.