Wow, thanks very much for the great responses!
After doing some super speedy number crunching, I can clearly see the difference in theoretical enmity (and damage!).

@Bixby: That enmity link you provided was absolutely marvellous. It really highlights potential changes to my rotation.
Also thanks for the heads up about that macro. I was sure there was something like that, but couldn't figure it out. Ha...

@Ignnis: That's really handy, I'll keep it in mind when trying out different ways. From what other people are saying though, I'll most likely stick to just marking #1 or foregoing the process entirely. (A lot of tanks seem confident in holding EVERYTHING no matter what)

Thanks again!