Last year, I had the same TY at #1 position for all my advanced programs and I explicitly stated that when I sent my email. If you're changing the #1 depending on the advanced program and sending multiple emails, that's still lying/misleading the programs unless you explicitly state your intentions, at which point it probably doesn't do any good (and may hurt). I matched at my #1, but I asked my PD about those emails this week as we finish up interview season, and he told me that it doesn't have any bearing on his ROL. It will hurt either you or at the least your schools' reputation the ensuing years if you mislead the program. If you're going to do it, be honest about.