I have the same issue. I took a pair of the christmas tree type plugs, pulled of the foam and put on the silicone christmas trees. The still don't fit my ears well but, they are far better than the foam ones.I tried a pair of Walker's "ear buds". The foam plug inserted into the ear was to silence the kaboom and amplify voices. The ear bud foam would not stay in my ear, it just kept backing out. I am familiar with wearing foam ear plugs, I worked heavy construction. I know to 'roll' and compress the foam. The problem was just to much foam. I contacted Walker and the response was a zero, very. very poor. They will never get a recommendation or another purchase from me.
These aren't the exact ones but, something similar.....