Birdlocked discussion

I own the Birdlocked Classic (45mm), and it fits tightly when I first put it on. But within a day or two, my left testicle—being the smaller one of the pair—usually slips up above the tube. Once that happens, there’s a good chance the whole unit will slide off.

I usually strap it in while showering, using soap to help with insertion. Afterward, I rinse off most of the suds so the silicone can grip better and reduce slipping. Does anyone have tips for modifications that might keep things from wandering?