I should say, Welcome to the forum and the Club, let's hope that you find the solution here.
The first thing I would ask is are you overfilling the coolant? not intending to teach you to suck eggs as you obviously are more than capable with the work already carried out. That fill mark is very low down in the expansion tank. There is a mark on the outside of the tank, but I always find that harder to define.
Good luck.
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