Too tight ring or too loose? I need some clarification

I can manage around four days of continuous chastity wearing my HolyTrainer v2. The issue is always irritation on the underside of my testicles. I’ve experimented with lubricant and applying lotion often; both provide some relief but don’t completely fix it. Most people here attribute their discomfort to a loose ring, yet when I remove the device, the raphe (the line down the center) appears swollen, suggesting maybe it’s actually too tight instead. What do you all think?