Most of the Ke Nalu team crew love their Wiki blades in the surf.
They are 84 sq" and are available in Elite (carbon) or xTuf (fibreglass) construction and weight is similar for both at that size.
Bonus with the xTuf blade is that it is tough as nails which you want if you are surfing reefs a lot.
The xTuf and xTuf(S) shafts have a really nice flex pattern for a surf paddle and they are bomb proof

Try and demo one if you can.
Disclaimer: I'm the Aussie distributor for Ke Nalu.....only cause they are awesome paddles