So I'm pretty light 65-68kg and currently have a Simmer Quantum 75 but would like to get a bigger board to get out more on lighter days up to say a 6.1m sail max but not sure what size of board would suit me, pretty competent getting into waves a bit more and slowly upgrading my kit from the decade old stuff I've been using.. Now have a 2015 quiver of Blades 4.5, 5, 5.7 and my older sails Ezzy 4.2, NP zone 4.7, 5.3 and a Hot Sails maui 6.1 that fits on my 430 mast. I know we're heading into the windy season here in Perth but think it would help my sailing having a floaty board that I could use in waves in lighter days and to work on some light wind freestyle to improve my sailing. Thinking maybe a 92L board or perhaps even a touch less, like high 80's? Any thoughts?
Cheers

I made the same move but at 75kg and went with a 100L custom Rider quad (not intended for freestyle) which has seen me out in 10 knots catching fun lumps at the local like yesterday with a 6.1(Dutch Inn). I can uphaul this when the wind drops so no worries in light wind and pump on to a soft wave. Now that my skills have improved I will eventually upgrade to a smaller board around the low 90L for light winds. I had a more skilled , lighter sailor out with me yesterday that was on a 5.7 / 85L combo and he was going just as well (or better ). So I would suggest a low to mid 90s volume (25 L over bodyweight) but if you are serious about getting in to freestyle you may want to get a Freestyle wave board rather than a dedicated wave board. Then as you progress you will probably go smaller.
The big advantage that quads have at Dutchies is smaller fins to avoid the rocks (although I still found a few the last couple of days on a low tide )

Thanks, think I'll aim for a low 90's board, seen a few Nuevo 92/93's on Seabreeze, seem to get thumbs up for light wind wave sailability....

My recommendation would be to go for a thruster rather then a quad. A 90 liter board should be a good start. You don't want to go to big. The bigger boards tend to have much tricker rails. You'll be struggling pushing the rails in with 65 kgs. Just my 5 cents... Better still see if you can test some boards and see what works for you before you commit hard cash.

starboard evil twin 87, oldie but def a goldie, if you can find one that is