I cannot speak for everyone, but I certainly got no "private fix" from IK Support. Did anyone, actually? I do not think that there
is a "fix" (private or public); I think that's just "how it is".
I ended up getting a super-clean, super-hot boost pedal and calibrated it to bring the signal (from either the Amp Out or a Line Out->reamp box) up to match the actual input signal levels from my guitars. It does the job.
To be fair, I looked around for either interfaces or ramp boxes that would do a good job of this on their own, but all the ones (of either) that I found were fairly expensive pro-level stuff. (And there are limits to what it's worth my spending money on!
) Since I'm not usually re-amping with the objective of obtaining a clean tone
I figure any tiny amount of saturation that might be introduced by the clean boost is probably negligible for my purposes.