Hi Ike! I agree with not being able to determine HG failure through intermix reliably. My '09 Impreza has a HG leak on bank 1 with no symptoms other than a minor oil leak. That said, without combustion gases present in the coolant, it seems unlikely that your current coolant issue is related to a head gasket.
Anyway, having just changed out that coolant tank myself a few months back, there's only 3 real possible ways for coolant to get to that overflow tube. 1) Coolant cap 2) relief/burp valve or 3) (VERY unlikely) a crack in the top of the black plastic.
I think the burp valve will fix it for you! Pullin' for ya over here!
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