FYI for the comparison to the IV you'll want presence pulled and mid gain. The VII is pretty much spot on. Sounds (and feels) like you're just switching between 2 different Mark IVs or maybe slightly different settings.
Recorded maybe that will be different, but in person that's what it was like.
Also if you have a dark guitar, gun the gain on IIB mode, treble up high as well, and boost it. Suck all the 750 out. With my cabs and guitar (JP16) it had a VHT type thing going on reminiscent of Extreme mode from the V, just in terms of punch/clarity. It definitely does not work for every guitar though. It sounded like a dying cat with my Legs Paul.
One last thing. The Fader EQ is not the same as the IV. You'll probably wind up with the same shape, but a more/less extreme cut/boost on certain frequencies. I noticed the biggest difference on the 750, where I cut way less on the VII than the IV.