What you are thinking of doing may be on the right track. I had some old school , cheapie muffs that I liked but the old foam insides was falling apart , I took out the old open cell foam and layered the insides with layers of 3/8th inch thick closed cell foam, securing with a little hot glue, it came from an exercise pad, I left just enough room for my ears . The closed cell foam seems to work better than open cell foam.
I'm sure there are other types of foam to try now.
These bubba muffs actually work quite well. If yours don't, pull out the foam and try something else.
I did a search of the term "acoustic insulation" and came up with several products that might be better than closed foam. Sprayed Cellulose Insulation looks good but the spray application might be a problem.
Gary
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