Some tips that I used were:
-Shave with the grain. Less resistance means less irritation. (This is the only way that I could shave my chest and my thighs prior to HRT without killing myself.)
-Shave during a hot shower, near the end. This allows the hair to soften prior to shaving, which again, means less resistance and less irritation.
-Moisturize your skin afterward.
-Make sure you're not using a dull razor. Again, resistance means irritation.
-Shave use short strokes rather than long strokes. (I don't know why this works, but internet sites always recommend it, and in practice it works.
-Try shaving using coconut oil. It really helps the razor glide over the skin, and lubricates the hair follicles so that they don't get stuck in the skin and become ingrown hairs.
And, probably the biggest thing that helped the red bumps go away permanently:
-Wait for HRT to work its magic. I know you're at just over 2 months HRT. And, well, soon the hair all over your body will start to soften. I could never shave my chest or my upper thighs without getting red bumps before, no matter what techniques I tried. HRT changed that. The hair, although still there, is a lot softer now. And at some point, HRT will indeed do that to androgenic body hair. It won't go away completely, but the hair that's there will grow in a lot softer and finer, which means that it can be shaved clean off with much less irritation.