I have solved my own problem with the GHK-cu stingies! Have only been using since Tues, but this is what happened for me:
Tues @ 1.5mg = annoying dull "pain" (not bad, just annoying like I was pressing on a bruise when I wasn't) and intermittent itching. The hard red blotch stayed for days.
Wed @ 1.5mg = same dull pain and itching, but I used my massage gun for a couple of minutes; reduced the welt about 50% and not much itch, but also not great.
Thurs @ 1mg + .5mg KPV = game changer! I pinned the KPV first, then the GHK right in the same spot, used the massage gun and zero welt or itching!
Fri did the same to verify results, and again no welt, no pain, no itch, nada.
KPV is the true MVP here, I think. I'll up my GHK back to 1.5 today just to see if that little dose difference changes anything, but I really think the GHK+KPV stack is the best way to have no issues with the copper.