Some shaving soaps, though of the highest quality, set my Hollywood face on fire. I call them volcano soaps. Perhaps you have come across this problem as well.
Musgo Real and Gold Dachs give me a gave me an excellent shave, but they set my face on fire. Finally I surrendered and stopped using them. No other shave soap or cream I have used has the same effect on my face.
Perhaps a chemist out there in the shaving world can give a good explanation for this.