I conceived my son on Clomid, but I was also on metformin. I'm also not IR, but my endo + RE did think it best to put me on insulin meds. There has been research showing that metformin can be helpful to cysters, even if we're not IR. In my case, met never restored my cycles, but did lower my testosterone levels. You may be fine not taking met. It sounds like you've definitely done your research and are making an educated decision with your doc.
I have seen thin, non IR cysters around here who've conceived on clomid alone. Hopefully some will jump in to share their stories with you. I suspect Clomid alone probably would have helped me ovulate, but in my case, the addition of met helped provide a more opimal hormonal envionment to support healthy conception.
I agree that it's tough to realize that you can't easily let "nature take it's course" with PCOS & TTCing. I found that frustrating too. I tried without meds for a while and on met alone with no success, but conceived after only 3 cycles of clomid.
Good luck determining your next steps!
