I agree with earlier comments. Your problems mirror mine & many others when going down the 22" road.
Read thru this post, it may help.
http://forums.justcommodores.com.au...082-help-ve-calais-wheel-alignment-issue.html
My experience was this: - Hey this was my experience with the balance problem on 20" mags. I had the same issue when 20" wheels & tyres where fitted.
The tyre dealer tried all sorts of things to rectify the problem to no avail. We tried different balancing machines, balancing the wheels with the finger plate into the stud holes on the balance machine, hub centre rings, tyre pressures, different set of wheels, "on car balancing" & still no joy.
They kept saying that big mags can often have these sort of issues.
After several months of mucking around I had them strip the tyres off all the rims, & run them up on the balancer, to check if they were buckled or out of round but they were fine.
I commented on the amount of balance weights on the rims & then told them to fit a different brand of tyres.
They fitted up the new tyres, balanced to 0 on fine balance straight away & hey presto problem solved for good.