ABS/ASR operate by detecting the relative wheel spin between the tires. Some people with staggered wheel sizes, as you had before, have experienced problems with the ABS/ASR computer if the difference between front and rear sizes was too great. If you had no problems than obviously the 1 inch difference made no difference.
As far as the vibration, with my car I've found that a "finish" balance on the front wheels is required whenever I change tires or rims. This is done by balancing the tires by spinning them on the car. Mercedes dealers have this equipment. If you remove the rims for any reason, you will need to mark or "index" the bolt hole position so you don't lose the balance.