I'm 6'4'' and 95kgs.. You're right.. Taller people do need more stable boards.. and IMO the 10'10'' x 32'' Nalu would be a good choice..
A better flat water paddling board would be the new 11' x 34'' Glide Touring.. [my next board]
If you're after a better surfing performance board this new 11' x 31'' Nalu would be perfect..