don't know your reasoning, but when i scheduled sub-i's i thought about doing that to see a couple more programs and make myself familiar. my adviser (also home program PD) discouraged me. he felt, and this may be particular to our program or region, that you didn't learn enough about the program to help, and you also basically told the program they didn't make the cut to be one of your "real" sub-i's. just a thought.
cheers.
mary