I'm glad you are "enthusiastic" about calibration! Then, consider this:
ALL calibrations are compromises and recommendations and personal taste for audio tape.
So - I would suggested TRYING different settings and seeing what output results you get. The sound can vary a LOT with a few simple changes. Try this:
When you "overbias", try different amounts. Like 2.5 on tracks 1/2, 2.0 on tracks 3/4, 1.0 on 5/6 and even 3.5 on 7/8. You have then done "stereo pairs" of different settings and you can print music, drums, vocals to them. Just hear what changes on the results - some will be bight and fizzy, some natural, some dark and punchy. It's all a compromise between high end and saturation levels.
You can do the same for Operating (Record) levels: how hot should YOU set your levels on tape - different calibration lets you test this.
EQ is not something you can tweak as much - if you want "flat" response they have probably set it as close as it should be. That being said, I usually have playback on my 24 tracks set with a little less bass, and a little more treble. It just makes the tracks sit better in a mix.