Finally got round to swapping out the rear HR2 for an Assegai DH Maxx Grip - huge improvement! Felt like I had an extra couple of inches travel on the back - smoother, quieter and much more grip. Could finally load up the front end without thinking the back end was going to do something silly.
Also swapped out the front disc for a 220mm Magura and the back disc for a 203mm Hope. Didn't really notice any improvement in power but completely got rid of any brake squeal.
Did an 22k bike park ride yesterday taking it easy as I was riding solo but still managed to PB the majority of segments on Strava. Its taken a while but I feel like the bike is finally living up to its promise.
Reign e+ 1 XL, Spank Spike 60mm riser bars, lockon grips, Assegai DH Maxx Grip rear, Magura 220mm front disc, Hope 203mm rear disck, Brake Bros organic pads, Specialized BG saddle, Shimano MT8100 chain, rebuilt front fork (to eliminate excess grease).
Next changes - single click front shifter, Maxx Grip front tyre - probably stick with DHF though.