Me too and i went back a day later and they were 15g and 5g off left and right!!!!
Yip, I've had that happen too, when a normally excellent shop had a new muppet who didn't know what he was doing.
Have it checked again. Also an off alignment can throw vibration too. By the way what are the tyres like, even wear?? Nothing wedged into the tread, like a big stone, even something silly like that can upset the balance, some tyres are worse than others for that.