Sulastic rubber shackles get my vote for a little help in the rear end. Fox shocks (IMHO) Yield a "firmer" ride than bilstiens, i have ran both the 5100's and the 2.0 emulsion shock, and the 5100's are softer. You will have to do some trimming, relax the t-bars 1 1/2 turns (or more) and possibly get some other shocks, bilstiens and sulalstic shackles should cost 200 and 450, and thlat should give you a much more comfortable ride
Again, just my humble opinion
Iirc, RCD lifts are really only a true 4.5" lift, food for thought