Bigger might also be better in the short openers.

Shrimp pots can't exceed 10' in perimeter and 18" in height.

Guys that I know who have shrimped a lot like big entrance ramps to allow shrimp to get in easily. Tunnel entrances have to be on the side of the pot and the sum of the entrance/tunnel width can't exceed 1/2 of the perimeter of the bottom of the pot.

See page 136 in the fishing brochure for gear rules.