Have you locked your interface to the Kemper clock? Another thing you could do is free up some system resources before reamping. Freeze the tracks you've recorded with the FX and then try to reamp and see if things improve.
Latency compensation is also used when recording midi, but I've never experimented with it for audio. Should be as simple as setting the appropriate value, you should try that click test suggested by Navar.
I'll give this a go this weekend, thanks