Good frame, to be honest i hardly use the RP23 propedal the shock was a bit pants when i first got it, i sent it back to Mojo for some warranty work and they did a custom re-valve for £40 while it was open, if i had my time again i would just get a bobby basic float and have it re-valved or pushed from the get go, i’ve not noticed any flex but i dont have too much to compare it to, im 5’11 and ride a large, my bike has 150 RS RTL TI’s on but i would love to try some Lyriks.
There are loads of Heckler show threads, have a search.