See what happens when you take a couple of days off?
Your theory sounds reasonable, but someone else could make an equally valid case that you are blasting your solder plug across the room with the force of the expansion of entapped air between the two solder plugs.
Regardless of which of us is correct, consider solder plugging only one side, because partially filled via are more reliable than fully plugged via. Search the fine SMTnetnet Archives for a reference to a study by Roger Wild at IBM that showed an unfilled via to be the most reliable, a completely filled via was almost as reliable as an unfilled via, and a partially filled via was not at all reliable.
See the more we talk, you end-up being better off by not even filling the via at all.
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