As an update I replaced the bleeder valve mechanism and that fixed the pressure issues. Also after driving it a few times the trunk has remained dry and nothing has come out of drainage tube.
78F350 I think you are right and it was just coolant falling onto the exhaust from the trunk drainage holes which was a lot less scary of a reason for smoke than any of the reasons I was thinking.
I'm still not entirely sure how so much coolant could get into the trunk if the tank is actually fine so I'll still be keeping an eye on it.
But thank you everyone for all the help!
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