Hi, I received a Lite6 hotend, and it is extremely hard to push the PTFE tube all the way into the throat of the heatsink. There is ringing that can be felt, and is visible, inside the heatsink. The issue I'm having is that the ringing is adding unwanted pressure on the PTFE tube, and as a result the filament passing through. This is leading to unwanted under extrusion at the start of a line after a movement (even with the retraction turned completely off). I'm not able to get any worthwhile prints out with this hotend. This seems like a manufacturing error since I always hear about how great the E3D manufacturing is compared to the knockoff brands out there. I've tried to call and email E3D, but I have had not answer.