RE: Uphauling a 10 m sail on shortboard (iSonic 133)
Uphauling an 8.5 is no problem on the iSonic 125, quite easy actually. I imagine uphauling a 10.0 on a 133 would be just as easy.
My biggest is 9.5, and I never try to waterstart that beast. 7.5 and below for waterstarts for me. I do beachstart it in waist-high or below. I use the Epic deluxe uphaul, that thing rocks for the big sails.
Adjusting to the shorter length (mine is 231 cm I believe) takes a little getting used to, both for uphauling and for tacking, but once you get used to it, no problems. And I am not that advanced either, so if I can do it, anyone can...