For corrective pre-comp EQ I have been using Elemental Audio's Eqium more than anything else. A rather neutral sound, and about as flexible and surgical as one can get for that purpose, with 8 bands of fully-variable selectable parametric, -pass, -shelf, notch, and harmonic filtering. That of course assumes working in the digital domain, which I do that that point. If I'm in a studio with quality analog iron, I'll choose the "best" tunable parametric/bandpass/filters they have that will target the problem freqs.
I have worked with a MMP in the past; it's a great piece of gear! I'd love to have one myself for tinting my tracks and even my mixes with that great Manley sepia tone. But again, it's not going to be my tool of choice for targeted 2mix *correction* unless the problem just happens to fall within its available parameters.
Again, YMMV, IMHO, QUIDPROQUO, ETC.
G.