I DID IT!!! okay so, when I did a 22.5 today (wasn't first time I did a 22, that first time was about a year ago) I noticed I could potentially do a 21 with about two more grenade boosts. I never thought I could do it but I also wasn't expecting to get this in only 2 hrs & 17 mins! very surprised and very happy about it. :) Although not happy with the frustration it caused :(