Introductions discussion

Hello everyone, I’m fairly new to the world of chastity, as my girlfriend and I recently purchased a CB6000 following my initiation. I really enjoy being locked up and love the teasing and denial aspect. I am also MtF trans (identifying as a transvestite, though possibly transgender). My goal here is to get help with long-term denial/locking while achieving an experience that is both comfortable and discreet. (Note: I cannot wear my CB6000 under a skirt) So, my initial question seeking advice concerns the fit of my CB6000. I am currently testing two base rings. One allows me to achieve full erection with just the cage resting at the tip; I can get nearly fully hard while the tube/cage sits on top of my erect penis. However, this base ring has slid down about an inch along the shaft, leaving my testicles somewhat stretched out. It’s not quite perfect. I want to fix that sliding issue. If I switch to a smaller size base ring, I lose most erection capability, but it fits snugly. This works fine during the day, but at night, when morning wood hits, it can be extremely painful (details below). So my first question is: What kind of sizing should I aim for with the base ring? Should I prioritize being able to get a good erection (meaning a larger ring) or should I consider shortening the cage length by using a shorter spacer? Currently, my penis sits mostly at the end about 80% of the time, leaving some room when fully flaccid. The second question: I wake up with quite painful large erections. With the smaller base ring, my erection size is modest, but there is noticeable swelling in the penis (which I actually prefer since no erection feels more authentic). HOWEVER, my stomach and internal area above the penis ache significantly. It’s almost as if blood has pooled there or I am straining internally. Any thoughts? Is it too tight? If I wear the larger ring instead, I can achieve a big erection, though it remains somewhat uncomfortable. Does anyone have advice on how to reduce morning wood or make it pass easily so I can return to sleep? Apologies if this is cross-posted: as a new forum member, if I don’t get replies here, please let me know if it’s okay to post these questions in the CB section. Mark