Greg Ferguson
Legend!
It has nothing to do with the guitar being a midrange instrument. It has everything to do with how our brain evolved and adapts to different loudnesses of various sounds.They sounded great at room volume in an isolated setting but washed out badly in a full-band mix. Midrange was noticeably lacking and, obviously, guitar is a midrange-y instrument. It may have been my zeal in adjusting mic placement or adding things like airiness and room diffusion but something was off.
The rule is to adjust the EQ of the preset at the volume you will be playing at, and the symptom you describe, of the midrange lacking, is exactly what happens when you adjust the lows, mids and highs to compensate at low volume, then later turn up the volume. Read about the Fletcher-Munson curve and you’ll understand.
As an FYI, the factory presets are all EQ’d at stage volume, ~95 dB, to make them immediately usable. If you use them as examples for the balance of lows, mids and highs, then you’ll be in the ballpark when you turn up the volume later.