Hmmm NPP shouldnt really crash like that. Thats weird. that ZPHC stuff, Im sure is overdosed wich would explain why. Buen, idk about yours but AP makes odd stuff if its legit.
Never really boiled an amp but vials I bring to almost a boil and let them sit in it for a good 20-30 min. If that wont do it you just gotta deal with it.