I haven't been on a variety of new, short wide boards, but I do think the rounding up is the nature of these boards.
I was out yesterday on my iS 111 with a 6.6 and hit some big holes where the board came off plane quickly. You just have to be ready to pull both feet from the straps (back foot first) quickly before you lose too much speed, particularly the front foot which has to be placed near the mast foot to keep the nose from rounding up.
It just takes a little time to get used to the process, but I think the advantages of the short wide boards out weight the rounding up issue. I agree that the slogging is a pain the a##.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.