No! to CB
If you let your 272LE (or other CBer) rest in the soft mud at low tide, this will force mud into the space between the CB and the well, a bit higher each time. Even wet it may prevent the CB from coming down. If it dries out (pushed above waterline or when the boat is on the hard), it gets very hard and may do damage to the CB. The comment about bouncing on waves or wakes is a good one, too. Cormorant solution for my O'Day 25 (CB): I leave a (corn "bristle") broom (inverted) at the top of the mast, hauled up with a double-looped spinnaker halyard. I position it so that the broom bristles extend over the mast top, leaving no room for the cormorants to sit comfortably. For the spreaders I put a bunch of nails into the edge of a piece of wood (like furring strip), two large "hanging hooks" (such as one uses to hold a bicycle on a garage wall) that engage the spreader tubes, and a top eye hook and bottom eye hook in the center. I haul it up with the spinnaker topping lift (attached to the top ring) and use the other end of the the topping lift as a downhaul (attached to the bottom ring). In place the nail heads end up over the spreader tubes and discourage birds from perching. This contraption I haul down and store everytime I go out and then reinstall when I'm ready to leave the boat. The mast-top broom and spreader contraption have been working pretty well for over ten years. The cormorants pass on my boat and head to someone else's mast top or spreaders to perch and look for fish.