I had this same concern when setting up aways last year.
I did 2 west coast aways and got most of the northeast interviews that I wanted. Didn't feel that there is too much discrimination with granting interviews. However, if you are from CA (as I am), then you will be asked why you would want to go to another location for residency. They (often rightfully) assume that we CA ppl all want to stay/return to CA for residency.
My advice would be that if you really want to go to the West Coast, then do 2 rotations out west. This will increase your chances at these respective programs. I don't think that you will burn many bridges by doing this.
