I can't see any way you're going to get away with not having bags on the floor - It's just the nature of the layout of that boat. If you can get past that, wow, you can really sack that thing out! Just add as much weight as you can down the side and especially in the back corner. Don't neglect the front though as too much weight aft will shorten the wave.
The hull will support as much as 2000-3000 pounds.