It’s not the motors - I have tried a couple different ones.
BUT - huge breakthrough - I found a 0.6mm nozzle in my stash, and I tried it, seems like the indentation is completely gone!
I am gonna have to go find a 0.4mm nozzle in the stash, and will report back with the results.
Wow, after so many tests, so much time and material wasted for testing different factors, I forgot to test the most obvious thing - the nozzle.
It for some reason was so obvious to test that early on but I overlooked it because “it’s a new nozzle, it cannot be causing issues” - don’t buy cheap nozzles people, you will save money on the nozzle but pay with your sanity.