Okay @ckemper, I have some clips for you here.
01 - Profile without any of the low-suppression EQ I normally do
02 - Profile + Wah HPF @ 1.4 (boosted "peak" and used a spectrum analyzer to find ~100hz at the peak)
03 - Profile + studio EQ low shelf @ 100hz, -12db
04 - Profile + Equality (VST plugin) HPF @ 100hz, 24db/oct
What this test shows me is that the Wah HPF is totally capable of achieving the results I want, and that the Studio EQ when dialed to drop out the sub-lows I'm trying to get rid of negatively impacts the useful low end of the tone (I'm assuming the rolloff doesn't start exactly at where the knob is set?).
So this is my conclusion - I can get what I need to out of the Wah HPF/LPF blocks, but I would need to use both the X and MOD slots (the Wah filters aren't available on the Reverb/Delay slots), which means I can't use any post-amp FX other than the Wah filters. This is what I find unacceptable, because this particular profile already has Studio EQ in the X slot, so I can't do both HPF and LPF via the Wah filters here even if I wanted to.
What would be ideal IMO would be for the Wah filters to be built into an additional page on the Studio EQ; i.e. the Studio EQ would have the existing hi/low shelves and dual mid-band w/Q controls, and then an additional set of controls for frequency/slope for HPF/LPF.
If that is too big of an ask, would it be possible to combine the two Wah filters into one block with frequency/slope controls for each filter, and have the control scale be in hertz rather than the current Wah filter configuration?