At 108kgs, I tried to uphaul a 6.4 on my 109lt (weight +1) last week, got the sail up although was nearly knee-deep under water, but unluckily didn't have enough wind to move me, so sank. Got soooo, close, the trick is to set everything in the water first & move fast before you sink. If you can float, then it's more balance based technique.
If there was enough wind here, I shouldn't be even attempting it!