My understanding is that hard-core racers will wait until shortly before the start to put their boats in the water and take them out between races because they can absorb a few pounds of water an hour. More weight = slower. I suppose if you sanded the gelcoat a little bit and then applied an epoxy barrier coat that could help with the issue of water absorbtion. Also I suppose if you locked the mast so it didn't rotate and then tightened the rig with the jib halyard that could help with that issue also. I suppose if I had no choice but to moor/anchor the boat I'd do something along those lines.