I'd go in to Big Winds and ask them if they have any demos? The 65 would be plenty big if the biggest wing you use is a 5m. Hrdest thing is getting used to lack of stability getting onto the board, which will be a lot less than your Kalama, but you'll probably plane up just as easy if not easier with a decent puff.
hmm. a bit of warning in going too low on volumes.
I use a 85L and weight 95kg. The ML85 is both my light wind and strong wind board.
However, in wind less than 7-8kt, particularly with chop, taxing and slogging is not easy as the board sinks and its quite wobbly.
