I just down sized in length & a bit in width & volume. From a JP 6ft x 26inch x 95 volume to a Sunova 5ft 3inch x 25inch x 92 volume.
I chose shorter for when I do more wave riding with the wing. And my bigger board to do paddle board foil surfing which replaces my older bigger, heavier paddleboard foil.
I still don't knee start. Might be due to back injury or my foot being bitten by a shark around the ankle. But have pretty good movement. Or probably not enough practice. I just cannot get my foot forward without it going off the side rail, under the water & back up.
So I still do the typical paddleboard mount by standing from all fours to then raise the wind wing. And that's why I chose not to reduce much in width & volume.
I found it not much different mounting on still water. But oh my god! So frustrating on ocean chop & swell! More falling than riding!
I found the smaller board basically the same on jibes except if I lose that speed & drop back onto the water, I lose balance & fall in. The larger board I could balance & pick up the wind & get going again. So challenges ahead for me again.
If I could knee start then I would have had far less frustrations going to this smaller board.
So if you can balance fairly easy on your knees & do knee starts affectively then I believe you would have no problems going to a smaller board.
I have just recently been able to complete my jibes about 50% of the time. Easier in stronger winds and when riding the wind swell which makes me carve left & right giving me a better feel in my turns.
When up on foil the smaller board initially it made me more tentative on my balance.
And I get less board speed on the smaller board, less pointing upwind when off the foil because of its braking effect due to it being short & wide compared to the longer & narrower Down wind type boards. But still find it's just as easy, if not better to get up on foil compared to my bigger board by less pumps needed if I keep the board flat.