I have the 622 Big Bens which are very similar. How much wobble are you talking about? I have slight run out on my front (can't see the back) and never thought it was not normal. I can see it while I ride and, sure, it would be nice if it was arrow straight. I don't think that can happen with a large tire?
I do 50psi and they usually run down to about 40psi after a couple weeks and then i put them back up to 50. If I go down into the 30's they feel "sloppy". At 50, they still feel "absorbent".
Here is a video of my front tire. I can't feel this run out at all. is yours much worse than this?:
http://1drv.ms/1Lbixz1