Media Encoder CC 2019 crashing and causing kernel panics

SOLVED!! (kind of)

If anyone comes across this post and has the same issue, this is what I did to stop all the crashing and kernel panics:

I clean installed macOS High Sierra 10.13.6 (by wiping and installing via the internet in recovery mode) and now both the iMacs that used to have massive issues haven't crashed since reverting to High Sierra.

When I wiped the computers I also made sure the HDD's were re-formatted to HFS+ as they were converted to APFS when they upgraded to Mojave. Not sure if APFS was the issue or maybe the graphics cards, but four other iMacs that have more solid state storage run fine on Mojave, including an older 2014 iMac. Now the 1TB Fusion Drive and 1TB HDD are HFS+ and no crashes or kernel panics.