Sorry, haven't time to read the whole post, but wanted to give my experience in case it is any help to anyone.
When I conceived my ds I was on clomid and had been on it, i think, (long time ago) for over a year.
When i couldn't conceive again 5yrs later i was told, both by my new, fantastic gynaecologist, and later those at the fertility clinic i ended up at, that it was very suprising that i had conceived after so long on clomid - they said that after a certain time period (6-9 months) the beneficial effects become the opposite, and actually make conception more unlikely. It was something to do with the thickness of womb lining - I'm sorry I can't remember details.
I think this is worth discussing with relevant doctor/gynae. Realise it may already have been mentioned earlier in thread.
Anyway I DID conceive and my ds is now 13!!!
For my dd had further assisted fertility but that is another story....
Good luck one and all. Don't want to be pessimistic, just don't want people to waste precious time that may be due to inaccurate info.