I've heard a few pros and cons on keeping the old floatation in place, don't misunderstand if you feel the need to keep yours nothing wrong with that. As for myself I'm opting out, the small inland lake I'll be sailing in has a max depth of @ 15 feet. Land is never out of view and the danger of waves cresting over the bow... oh well. The old floatation was nasty at least in the stern a layer of mud covered most of the bottom underneath along with a number of water bugs. On a 22' sailboat you need all the open space you can use for odds and ends. just my two cents and by the photo it opens up a nice amount of space.

