I know the steeper will help but for me going from a 20.5 with a TL and 8.2 bars to a 21" with same tl and 9" made a huge difference. same HA so I know it was the frame length that did it. I Just think getting the 21" with the snappier HA would have had the best result.
I just finished building it up and I can honestly say I couldn't be happier with it. I love the feel of the 20.75, feels long but not too long, but it spins so easy. Also, the high standover and raised seat is super comfortable and gives me good stability in footplants.