Did i do a follow up to this thread?
I vaguely remember writing something about how the problem was resolved but just in case:
I ended up just running it (after a mechanic's suggestion) and having a ride around the valley for like 20 minutes, came back in, put a test on and the leak was completely gone. Everything sealed 100%.
All i can conclude is that something seated itself properly and thus the problem solved itself. Happily. LOLZ.
This same scenario has happened again since. The very same things happened: crank went back in, i put a leak test on, found the one way cross leakage (in the same direction), fully assembled and ran the bike for a short time, re-tested for leaks and found none.
Luckily the issue is consistent and fixes itself!
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After years of moaning about immigrants now i am one...