Need help with butt plugs

I F19 recently got a set of butt plugs, they feel fine and nice, the only problem I have with them are the base, I have a pretty phat and boney bottom, and where the base rest, I guess the best way to describe it is that my cheeks kind of rest up and push up against it, does anyone where who use them, or know someone who uses them know a solution to that probably, and sitting down too also hurts kind of, I would like to try and get up to an all day wear in the near future, and not have that kind of problem, and the plugs are silicone if that helps any, and thanks again for the advice