Honestly, I find these issues bog down bedroom guys and not gigging musicians. Guys playing out realize each room is different, where they stand changes things and with so many other variables in play, these subtleties don't even register anymore. You'll be better served dedicating the time you'd need to go from tone 98% to tone 99.5% practicing and learning your instrument.
Keep in mind, guys like Jimmy Page used a Les Paul and Marshall stack because that was all that was available then, maybe in his mind, the tone was only 60% of where he'd have liked it to be.
Based on what you say, this forum would not exist.
I play in my studio and gig weekly, and I know when something doesn's sound as it should, not a matter of this ot that room/reverb/mix, but lack of dynamics from the original signal.
Anyway, after hard testing and lot of tweaking, I've solved the thing, was a matter of volumes between the send/return/kemper volumes/fxloop level.
Now both signals are exactly the same, thanks all.