i'm 1.85m tall (just over 6 foot) and 85kg, and I ride 6'2 x 19 x 2 1/2 or thereabouts usually.
I like volume around 30 - 33 litres, but I can definitely feel it when I haven't surfed for a while. I went out on saturday, haven't been in the water for over a month as I cut my finger badly. I was dead in the water!
I'm not really the best person to be giving this kind of advice on board design, but I was interested so I replied

Hopefully Huie can give some thoughts on what you should be riding?