Painkillers are too tight, direct and surgical for Metallica... The Miracle Man is more appropriate.
There's no way you can achieve the 80s hard rock tone (Slash, "Snake" Sabo etc...) with them AND with a ceramic pickup in general. at least that's my opinion... i can suggest you a Rebel Yell bridge pickup for that (ok, Slash uses AlnicoII low output Duncans, that have half the power of RYs, but they're very versatile for both hard rock and metal - i play a melodic style of death metal and they're powerful enough!)