So, either I got the very broken silicone boot sitting in a good position between the heater block and heatsink or the thermal grease is working. But I’m back up to 7mm of retraction at 55mm/s and printing very well. PETG at 250’C print speed set at 55mm/s … will go back to 60mm/s after this current print and see if it changes anything. Waiting on new hotend kits, with entire boots, and grizzly kryo grease to arrive, after that hopefully I won’t have any issues. I wonder how PLA will work…