I had a 9'5" widepoint and went to the X32 8'8", but that was after 8 months of SUPing and I had almost 20 kg on you (at the time). So I think you can afford to go shorter. The 8'10" Speeed (which I also have) is less stable than the X32, but I suspect you'll be fine on it. It is a lot of fun!
I also have the 7'10" Minion, which is even less stable than the Speeed. It is my go-to board if the waves are fun size - but at this stage if it is windy/choppy then I find the Minion a bit tricky (but I am 88 kg and 6'3"). So the Minion would provide a real challenge, but it is very maneuverable.
So many choices...