I know there's lots of support for the Nekton boats, but......
Just pay the extra couple of hundred dollars for the Belize or Cayman Aggressor. You'll be glad you did.
Just for starters, the dive/gear deck is about 3 times the size, and all your gear is in one place instead of on several different levels; plus having a dive locker all to yourself that's 4' wide x 3' front-to-back is pretty choice. And there's less people on the boat. And the food's better.
How about an endless parade of hot towells? All you need, take two, draped over your shoulders as you climb from the dive platform. Not to mention the boat can go full speed without trying to submarine underwater.
Or, the Aggressors don't have to keep the bow high and stern low so the plumbing works.
Just say'in. It's way worth the extra mere couple hundred dollars. And the Belize and Cayman crews are superb.
All the best, James