Also, I know you're using Headblade, but what blades are you using with it? It's worth trying a few different types that are compatible with it, to see what works best for you.
Another thing, which goes against the conventional wisdom: I don't know if anyone else has experienced this, but I know that I have more scalp problems if I don't shave every day. The returning stubble really irritates my skin. I can get away with not shaving maybe one day a week, but if I go any longer than that, I run into problems. You mentioned that you shave every other day. You might want to try shaving it daily. I know it seems counterproductive, but it worked for me.