You have a db2 if I read your signature right. Is it stock with stock turbo? If so you'll notice a big difference. Plus you'll need to make sure you're cooling system is top notch.
Put a camera there so you can record while actually turning the key. Alot of times there's an initial rush of bubbles that can be missed by the time you get back to the IP
Seems to me you're avoiding the obvious. Put on the clear return line. Acts like it's clearing air out when it's getting started. You've been asked to multiple times.
Termination dust is what falls in the higher foothills reminding us that summer is over and winter is here. We don't really have much of a spring or fall