@Locrain wrote:
“I am wondering if has something to do with the KPA's extreme (IMO) oversensitivity to different guitars/pickups. But that doesn't make a whole lot of sense unless we consider this sensitivity to be so extreme that it is a legitimate issue (not a feature, but a bug) because you have several very high-quality guitars there.“
The KPA is no more sensitive to individual guitar differences than analog guitar amplifiers. Guitars that are not designed to sound like Ike telecasters will not sound like a telecaster.