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Gorgo said...
7S Superfish XL (7'3"x22"x3")
7'3" and "fish" should not be used in the same sentence IMO. This is more about selling qty with buzz words rather than matching the right shape to the right guy.
I suspect your 6'10" may be a gun style board... Thin and narrow, and not a lot of volume all up. It's not fair to make assumptions of volume based on length alone. If you want paddle power go for width and thickness, especially around the chest. The length can be whatever you want then, but nothing beats a 'real' fish of 6 ft and under for wave count and fun.
Contact Dave from Treehouse if you need more help. He's the master at matching boards and riders for their usual surf conditions.