Flux are great if you don't need canting and too much dampening. Super solid and light, great ratchets and straps.
The difference between the RK30 and the TT30 is that the RK30 highbacks are very soft. I found them very comfy but mainly suitable for jibbing and park. The TT30 highback has that typical all mountain flex. not too soft but still pretty flexy. Can't go wrong with them.