XL Bodyboards for larger riders

At 6'2" 270 pounds I'm a big guy. I'm fairly muscular, if perhaps a little overweight, but I don't have a gut hanging over my belt or anything; I'm just a big. That said, my bodyboard just doesn't have the buoyancy to handle my weight. Paddling out I'm mostly submerged and the current really drags on me and my board feels sluggish riding all but the biggest waves.

The traditional rule for sizing a bodyboard is to get a board with a length within one inch of the height of your belly button. For large waves an inch below and for small waves an inch above. The advice is often repeated but I've never heard a real reason for it, though it seems to work fine as a starting point for most people. Following this advice my max board length would be 45 inches, which is the length of my current board (45"L x 21.5"W x 2" thick). It was a good board for learning on for the price and I'd definitely recommend it to any first timers, but I need a larger, more buoyant board.

Bigger than 45" there are only a few models available:

• Custom X Beast 260$
• 48"L x 24.5"W x 3.5 thick
• Core: Polyethylene (Dow) core
• Two stringers
• Polyethylene deck and rails
• Crescent Tail
• Wave Skater Pro 180$
(I recently reviewed this board)
• 48" Long x 23" Wide x 3" thick
• Compression molded EVA/PE foam
• Unique one piece construction 
• See full info here
• Manta Pro XT 46" 230$ 
•  46" Long x 23" wide x ??? thick
• Beaded Polypro Core 
• XPS Bottom Slick
• Double F Stringers
• JL Designs Porpoise Board 57" 260$
• 57" Long x ?? wide x 3" thick
• Single stringer
• Flat Bottom

Or you could I could choose a Custom Board

• Kenu Hawaii 295$ and up + S&H
• Any length, size, shape, specs you want
• Fin boxes for skegs

So what will I choose? Well I'm not sure... if anyone out there has any experience with any of these boards I'd really appreciate your feedback.

Thanks, stay stoked,
DH