Holytrainer V3 Fails to Stop Erections for Me

Hello! I picked up a holytrainer v3 recently after several friends suggested it. I mostly love it, but there’s one crucial issue: it doesn’t stop me from getting hard. Actually, when an erection does happen, it hurts quite a bit. The cage gets shoved forward and tilts downward because the ring stays put. I’ve tested rings in 36, 40, and 45mm sizes with no real change to this problem. I believe the “tube” fits right (it’s tight but reaches all the way up). If I push the cage inward while getting hard, it feels fine and painless. I attached a photo showing my view when erect, plus another of how it looks soft here:

Most of your erection happens internally; a cage can't stop the body's natural urge to erect. What it does is limit the visible part so you don't get as much use out of it. Could you clarify which specific area hurts? That detail isn't entirely clear yet.

The pain comes because the erection forces the cage outward. Since the ring holds firm, it causes a downward rotation (which isn't great for my erect penis's comfort) and pulls heavily on my balls. It gets so uncomfortable that I sometimes wake up at night due to random erections.