Since that soldering material is all over the hashing and controller boards is just a matter of time chips keep coming off the boards, the only and costly solution is to desoldering them all and soldering back with a good quality soldering flux, other than that those miners will keep failing over and over.
Basically most of the S17 series are doomed.
You have just explained 'scientifically' what I have been trying to tell everyone for months, dude we need more people like you around.
So, since the soldering melts at fairly low temp, will under-clocling these miners give any improvement in the lifespan of that tin before chips start falling? Or should someone just overclock the heck out of them because they will melt either way? Or leave them at stock?
Also what soldering flux do you suggest to use? A product link from Amazon will be great.