Aneros not sitting properly

I got the Aneros MGX Trident a few months ago and have gotten great pleasure from it, but I’ve been having one small issue, the perineum tab. When I start to get really good feelings my prostate begins to swell, and this causes the P tab to shift and move to either side of the prostate. Not only does this make the p tab pretty ineffective, but it also changes the angle of the massager, making me need to readjust and takes me out of the moment. I’ve tried to put a folded piece of toilet paper between the p tab and my skin, which works to a degree but definitely decreases the overall sensations.

I’m not sure if this is a common problem, or if anyone knows of a good solution. Should I look into a different model?