[LMS QA] other

I made pretty much the exact same move, older Kenwood to the 7300. The ATU thing you mentioned on 40m — are you running the end-fed with a matching unit at the feedpoint or just straight into the radio? I ask because mine was doing something similar and it turned out my 9:1 unun was the culprit not the radio ATU. swapped it out and 40 cleaned right up. might not be your issue but worth checking if you havent already.

came from a TS-590SG to a 7300 and honestly had pretty similar experience with the WSJT-X setup taking forever. the audio codec stuff through the USB is great once its working but getting windows to not mess with the audio levels automatically was the part that got me. theres a setting buried in the sound properties where you have to disable all the windows audio enhancements or it keeps adjusting the levels on you. might already know that but just in case.