Comes down to having crappy heavy knockoff rims.. The inner diameter of the rim is what interferes with the top of the caliper, the spokes clear fine.
The brackets I have rotate the calliper as well. Clearanced them with a file, not sure wether that is worlds-best-practice.. but I made it fit. Not using them atm, the adapters and a brand new pair of 324mm rda discs are just sitting on my shelf, waiting...
*offtopic. If you are getting that replacement mid section for the hks dragger exhaust made up - without muffler - I might be interested in one as well..