My first lift was the RK 2.5 X-factor on a 2012 JKR. After the RK springs, I also used the EVO springs. Both bowed in the back (even with RK coil wedges) and made contact till I cut the arms and moved them a bit closer. They still were a bit long. I eventually sold the arms and went with Rokmen Johnny Joint arms. Those adjust down to stock size so I went back to close-to-stock with those. The problem with the RK arms I had was that if you don't tell them to give you arms that adjust down to stock, you are stuck with an inch stretch. I did not realize that since that was my first JK and first lift. Yeah, my hack of an installer did not mention that either. That is a nightmarish story- the RK "installer" who they seem to have cut some ties with now.
Since I only have 35s and don't do anything truly hard like the JK-Experience crawling you see, I tried the AEV drop brackets. On the 2-door, it really improved the choppy ride and brake dive so I was sold. I am not sure what the improvement in on the 4-door (maybe not as significant?) but I used them on this new JKUR and ended up selling my Rokmen arms. The ride is great, and the 4-door naturally drives better (esp on pavement) than my 2-door. If I run into clearance issues, I'll consider removing the AEV brackets and running adjustable arms (maybe Rokmens again). If I stop spending money on bikes, I'll spring for a long-arm setup and coilovers in due course. I think that is the ultimate setup for good handling.
Interested to see what you think about the RK setup once it is all sorted.