I've seen plenty of instances of wedges shaking up and out. In all cases this was solved by making more accurate wedges that contacted the partners over almost their whole depth.
Even a steep wedge will lay against the mast flat and provide protection to the mast but if it's only in contact at the upper part of the partners it's just an incline plane that wants to shift the load.
Make a very gentle bevel. As a start, make the wedges way too long so once you get them set you can mark where to cut the bottoms off. Flat bottoms makes getting them out easier as well.
Make the bevels fit. If a round or ovular mast, the inner (female) arc is a bit tighter than the outer. Get these right for good contact. Whether flat or round sided, number or lable the wedges so you can get them in and out without a lot of fooling around.
Personally, I do not like rubbery wedges. They move and they have high friction making them hard to set and harder to extract. Good hardwood wedges properly shaped are the way to go.
Even on glass boats.
I' not against the poured wedges if the parnters are beveled just a little, bottom a sckoch smaller hole than top, so you can set and remove with confidence.
G'luck
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