Razor Bumps can take a varied amount of time to heal as you know. The key I think is that you must shave the right way so that the hair is cut proper and will allow the inflamed area to heal. I have slowly seen my issue which I still slightly have diminish as my technique has improved. Give you bumps a time to heal I mean scab or puss filled bump. Exfoliate to free the hair some. Then do an amazing job of prep. Shower, towels, let shaving cream/soap sit with hot towel on top, relather then take short confident stroke - to free the hair - and a proper aftershave regiment. As you technique improves so will your condition.
EXPECT success in every shave and the universe will certainly make way for that success.