Haven't ridden the new fork, but did talk to Jake at Ohlins about the differences vs. the current RXF 36 EVO (which I'm super happy with, been riding both the coil and air version). He said that most of the noticeable improvements are already in the EVO. The 18mm piston is obviously different and theoretically would mean less friction, but it sounded like some of the EVO mods (like the split piston band) made even more of a difference. There are also slightly longer travel options with the new fork.
One option is to pick up a used RXF 36 for a good deal and send it in for the EVO upgrade (have them check the lower bushing sizing as well, in some earlier forks the bushings were too tight resulting in tons of stiction). If you go this route make sure you get a TTX version. There is also an STX version that was OEM stock on the Enduro Pro for a while, but confusingly the name "RXF 36" was identical. The STX only has a LSC adjuster on top of the left leg, the TTX has both LSC and HSC (which also has a climb mode).
Regarding creaky crowns, sorry to say but I think ultimately any single crown fork will develop that if pushed hard enough. I recently had it happen on my RXF 36 coil, but Ohlins did replace the CSU under warrantee. It did at least seem to take longer to happen initially than other forks I've had in the past...
