At 6'2 and 90, you know deep down you are way over Jockey Weight, and probably shouldn't be knee paddling !!

About only guy I see knee paddle down here is Johnie from Glide Fins, and he's Jockey Size and Jockey Weight....
Generally speaking, upper middle weights (90kg) don't have supreme flexibility, and knee paddling is actually a bit uncomfortable. Plus your bum might get higher in the air, than a flexible light weight jockey, and your bum can put you off balance!
Don't mean to put you off knee paddling !!


But I would be thinking 10 x 23+ x 3+... Try some knee paddling on small SUP maybe.... to see if it is for you....
Prone Paddle Tips - engage your core, and increase your reach with each stroke, by getting your shoulders and stomach muscles entire paddle stroke.... gives you more power...
Just some thoughts.... Might not be telling you anything you don't already know....