Out of curiosity, are you shaving WTG solely, or doing successive passes?
I think your best bet would be a Lord Tech Razor. It's ~10 USD and a miracle-worker.
I'm ingrown-prone and find this razor, used in conjunction with any blade, to make for perfect shaves - albeit XTG is as far as I'll go.
It's head size is perfect - non-bulky - so you can really pay attention to what you're shaving and the direction in which you're doing so.
As for removal of ingrowns, BHAs, AHAs and Aspirin Tonics may work, but you can't beat manual extraction.