Belly/Naval Piercing. It to heal better?

My piercing is 2 months old. And one thing is that my jewelry is very tight (as you can see in the imag) and is surgical steel, so i ordered a longer size and in titanium. It keeps getting irritated or infected. I clean my piercing with once with mild antibacterial soap and once I do salt water soaks. After which I apply sofromycin. At the moment, I do not have any discharge, or redness, but I woke up so soar around the piercing today. I do not have fever, or any other symptom of a severe infection. Also, I did try using betadine powder as guided by my piercer, but my piercing gets irritated everytime and starts giving discharge, maybe the powder blocks it, i dont know. I would really appreciate your help. So my questions are: Apart from changing the jewelry, what else can I do ? Should I take antibiotics like Amoxicillin for 5 days ? Also, is there anything I need to apply on the piercing for it to heal better ?