Helix too small?

So I took the plunge on a aneros and picked up the Helix Trident a couple of weeks ago. I have to admit I really did enjoy it the first couple of times, no orgasm but definitely mass amount of p-waves.

I learned my PC and anal muscles needed some exercising so I have spent my time with it focusing on kegals and building up the muscles around the area.

I had issues with it slipping out when I would get right on the edge but focusing on keep my anal sphincter tight has helped. My problem is focusing on that muscle ruins the experience, yet it seems to pop out when I get ‘close’ in the positions that feel the best if I’m not squeezing to hold it in. The position that feel best for me are mainly doggy and on my back legs straight up or bent with a pillow under the small of my back.

I also noticed that the aneros doesn’t seem to “fill” me. I can feel lots of space between the toy and my prostate. I do play with larger toys from time to time so I’m wondering if maybe I’m just to “stretched” for the Helix?

Anyone else figure out they just needed the XL model and that solved their issues? Will the bigger ones stay in more firmly or do I need to just keep at it and eventually it will become like autopilot?