Chastity irritation troubles

Hello everyone:D I’m fairly new here and have really enjoyed the discussions I’ve come across. So, I thought it was a good time to share my experiences and issues with chastity that I’ve been dealing with lately. My keyholder and I decided to keep me locked up as much as possible a few years back. Like many others in this situation, it evolved from just a few hours at a time to being worn far more frequently, and we upgraded from an affordable knock-off to a “higher end” cage - which is how I ended up getting the HolyTrainer V2 several years ago. Things were going well - I was wearing the device for multiple days in succession, but my keyholder always ensured I cleaned myself and the cage once daily (which makes sense because with plastic or bioresin cages there tends to be more bacteria buildup, as I’ve read), so that wasn’t an issue. No more stroking, and significantly fewer orgasms - I came to love my cage, and I still do. Everything was fine until one evening when I noticed my dick becoming “sore” with rashes developing, particularly on the underside of my penis. I tried treating it with some creams, but the irritation persisted even after I stopped wearing the lock. It was itching badly, and since I couldn’t seem to get rid of it, I visited my doctor - he prescribed a special cream targeting bacteria/virus/yeast issues - although he mentioned at least it wasn’t yeast, which made me happy. After about a week, it cleared up and I could start locking myself again, though not for as long durations as before. It’s worth noting that back then, I often used baby oil for lubrication, following the advice of a friend who had been in chastity for several months. When the rash returned (after healing from the previous episode), I tried wearing my HT with some body lotion - and it turned out to work much better! The rashes stayed away for many months, and I was happily locked up at least every night…until a few weeks ago. The same problem is happening again now. A rash has built up on the underside of my dick once more, even though I’m only being locked for around 10-11 hours and then spending another 10-11 hours cleaned out and unlocked. I do clean the cage every day (with hot water and soap) as well as washing my penis thoroughly! Honestly, I have no idea how to handle this or what to try next. Should I get a new cage? Try different lubricants? Is there anything else? This recurring rash is quite annoying me (it’s not serious; I can heal it myself after a few days), and I really want to increase my lock duration (my goal is 24/7) - because I’m truly enjoying the lifestyle. But for now, my penis seems to be having some trouble with this:roll::| Does anyone have any suggestions? I’ve also been considering buying the latest HolyTrainer (V4) which has larger ventilation holes and newly shaped rings…hoping that this design causes less chafing on the underside of the penis compared to my V2… Thanks in advance for your help!:D