Chastity and orgasm denial discussion

I’ve just gotten into chastity and recently purchased a Holy Trainer. Even though I don’t consider myself particularly large, my girth is slightly too wide for the device’s tube diameter. Getting it inside requires the nylon-sock technique, which can be quite tiring. After wearing it for a few hours, I experience some numbness (likely due to restricted blood flow from the pressure). The Holy Trainer features a 35 mm tube, and the CB-6000 appears to have very similar dimensions. As a newbie, I’m hesitant to spend a lot on custom options right now. Does anyone have suggestions?