Hmmm, well I am not sure where you got the data for this, but here is my two cents on clomid, or clomiphen.
I have taken it 3 times, and all times it has produced multiple follicles.
My first time, I made 3 follies, the second time I made 7 and the third, (this time )I made 13.
I have had to have an u/s before taking clomid to check for cysts. Since clomid sometimes causes cysts they wantn to make suree you dont have any first. Then I have to have an u/s the day before IUI to check for follie size, and lining. Clomid is also known to decrease the thickness of the lining. Since like you said it is an anit=estrogen pill.
So I have to make sure that the follie's are mature enough to do IUI, and the lining is thick enough for implantation.
Just thought I would throw in my thoughts on actually taking the med.
This is a great thread btw.