Just called but bike shop and just explained what happened. The guy I talked to blamed it on my pump being inaccurate and over inflating about 50 lbs, (yikes!) that blowing tubes is a regular occurance (he goes thru 3 or 4 a season) and the mech that did the work has been at it 15 years... I'm not going to push it. They are all the way downtown (I live in the mpls far western suburbs so it's actually quite out of my way)
I do have a nice pencil-type bike pressure guage so I'm fairly confident in the pressure. Also previous to this set of tires, I've worn them out w/o ever blowing a tube. Might have had a flat, but don't remember.
Oh well, tubes are not expensive, and I understand anyone can make a mistake. I'll just pick up a couple and move on.