I don't doubt that a press fit is superior to the JB Weld/minimal, but loose clearance fit, but I did the loose fit with JB Weld when it was all the rage about 2 years ago (or was it longer ago than that). Yes, the little donuts of JB Weld came off after a few months and I have never had any leaks. Come to think of it, I believe quite a few people did them this way, and I haven't heard of any leaks.
So, I will ask the question, did you install overflow tubes with the minimal, but loose, clearance fit with JB Weld and have you experienced any leaking? Leaking or not, how long have you had this set up in use?