Fedora,
like you, I have experiences ingrowns along the shaft of my penis. What I have been doing is getting laser hair removal treatments on the shaft, and on the actual ingrowns. The light pulses are supposed to be strong enough to damage and eventually kill the follicle after x amount of tratments. I have had good results. I have not had enough treatments for the hair to be 100% removed, but the ingrowns have greatly disappeared. Also, the hairs grow back thinner, which make it less likely to cause the ingrown. I also have been exfoliating/scrubbing my shaft, which also seems to help prevent ingrowns.
Tripod