Don't know what to tell you other than get it on a lift, and shim it or bend the brackets or whatever you can do to make absolutely sure it is perfectly centered and doesn't move. At all. You should be able to almost hang from it. I had to shim my driver side bracket off the block with some washers to get it centered, level, and off the fan.
I just put mine in last week. Mine only hits the IC right before my tires hit my swaybar or the frame (275mm fronts on 9.5" rims). I can see where it would be annoying on a car with more stock friendly wheel and tire sizes.
The proper fix would be to scallop the tanks in the spot where they hit to make room. It doesn't need much. If they were steel tank, you could whack them with a hammer, but I'd be afraid the aluminum will crack.