I have a jailbird and i'm struggling to get the sizing right. It's incredibly comfortable, and stays in place pretty well. But it feels like I still get a full erection. I'm about 5.75" when erect, and it's as if i get 3" of erection inside, .25" of slippage, and 2.5" of erection in the cage. I guess it means I need a shorter cage, but I followed the MM instructions on measuring. And my off the shelf cages are all 2.25" inner length without this problem. Their base rings are one size smaller, but does that matter if the JB doesn't slip? Should i have the cage resized? Or the base ring?