It would be a great education for the forum if you could document the results. With fins you can do this because they can be switched on and off in the same sea state. I could not do that with the rolling chocks because it take a haul out and a couple of days work to turn them on and off
.
There are a few cell phone apps which record an artificial horizon, some are easily fooled by combined motion but some are pretty good. On iOS one called SCraMP seems like one of the best, very stable, and written for just this purpose. I believe it is free.
I'd love to see what the average reduction in amplitudes and accelerations
is.