
My wife and I decided to purchase a custom made chastity cage, since none ot the cages we already have fit really well. (See my other thread on this matter)
To be on the safe side, we ordered the sizings rings, but I'm still unsure which size I should pick in the end...
A-ring: The 1 7/8" ring (4.76cm) ring seems to fit well enough, with the 1 3/4" (4.44cm) being a bit tighter, however after wearing the second ring for a few hours there is a burning sensation at the bottom of the ring. Does my body more-or-less get used to it and it disappears, or should I choose the bigger one? (I'm not able to slip my balls through the 1 5/8" ring in a comfortable manner)
Round or oval comes down to personal perference, or anything else I should consider.
Cage Length. On average I get 3.54 (9cm) and the lowest measurements are 3.14 (8cm). Should I substract 1/4" or 1/2"? I'm a grower, if that helps.
Cage diameter: The 1 3/8" (3.49cm) ring fits comfortable but appears to be on the looser end. When I look down with my penis up and if I adjust the ring, it appears there is some space left on the sides. The 1 1/4" (3.17cm) ring is tigther, but it is also compressing my penis a bit.
My problem with my old cages (quick summary): When wearing the HT2 or a CB6Ks knock-off my penis slips partially out over the night. It seems to grow at the very base and keeps pushing and when the cage can't be pushed down any more, it slips partially out at the base, forming a strange (and uncomfortable curve). Sometimes, when wearing the HT2, only the head of my penis remains inside. The CB6Ks fits better, but since my glans protudes from the urinal slot it can get rather pinchy. (The slip out also happens with the CB6Ks, but it happens sooner with the HT2: 1 night vs. 2-3 nights).
Thanks in advance for your help

Gap: In relation to my measurements, any recommendations?