Oh yeah, I ride it mostly as a quad, with MRTFX up front, and small GL trailers in the back. But when it's bigger and has some punch, I swap the 2 GL trailers for the 1 MR trailer. It's fast as hell as a quad, and I definitely lose some speed, but when it's got push, it just feels right as a tri on the drop/bottom turn. More stable and more confidence inspiring
Bigger but not heavy (think short period windswell), I leave it as a quad and enjoy the extra speed.
It's a real fun board, just wish I could ride it more.
I'm 5'11 x 235 and I ride a 6'3 x 20.5 x 2.75 Lost Mini Driver. Something like this will work for what you're looking for. Get it in Hydroflex PU if you want it to be sturdier than standard PU. I kinda regret I did not go shorter.
I'm 6.0@195 lbs my 6.4firewire dominator floats my fine.even with full suit and all the winter gear.you can go on the FireWire website to find your volume range. If you buy a poly board it might be different. Epoxy seems more buoyant.