I don't think there's anything wrong with trying the antagonist protocol. That one worked for me the first time, but I did respond significantly better with the microdose lupron and a short dose of BCPs this time, and I was15 months older, which at my age, is significant.
It is so hard to say what's best, because it depends on age and dx, both of which are different between us. Also, I never used the long lupron, so I can't speak to the effects of that on my cycle. Did you discuss microdose lupron as an option? I would think if you did a shorter dose of BCPs with that, any oversuppression issues might be averted.