I like A4 too. So does Paul and the Dragon 1 and 2 neck pickup are A4. I put A4 in the Duncan 59B I use as the neck pickup in my Black Bernie Marsden and to me it sounds very similar to the Dragon 1 neck pickup. According to Tom Holmes, most real 59 Gibson pafs used A4. He went through Gibson’s orders and most of the magnets Gibson ordered in 1959 and received were A4.
I prefer roughcast (not polished) A2, A4 and A5.
A3 is the weakest but it’s nice for clean jazz. Not very ballsy but it gives a humbucker a clear plucky sound when my pick first contacts the strings.