I am a high gain guy and my favorite profile pack is the Michael Britt Crank N Go pack. Soldano SLO 100, Friedman BE, EVH 5150 and a few other amps. I got my Kemper powered toaster in March 2019 and bought this pack shortly thereafter and his SLO profiles have been my daily drivers ever since. The BE is outstanding, too. I have since purchased every other SLO profile pack I saw and none made the cut compared to the MBritt profiles. After about a half dozen others I stopped looking. The TopJimi stuff is very nice. He has made it a crusade to hunt down the Brown Sound. That is where I would start.
I still have my Soldano Hot Rod 50 half stack that was my main amp when I got my Kemper. I've tried profiling it numerous times and while each attempt gets a little better like you I have struggled to make profiles that sound as good as the ones I have purchased. Honestly, if I would have had to rely solely on the factory profiles or the Rig Exchange I probably would not have kept my Kemper.