If your tech has to put the weights on in two different spins to get it right he is using a balancer that should be properly calibrated or scrapped.

A computer balancer in proper operating condition and calibration will get a proper balance by placing both inboard and outboard weights where the machine indicates after one spin. Then respin and check. Make sure that they use weights inboard AND outboard. Otherwise you are only getting a static balance and the wheel, especially if mounted on the front, is amost guaranteed to vibrate.

Best of luck,