I used Menopur, Follistiom, and Lupron as my protocol. Like you, I had no issues at all (well, other than my age) and neither did my husband, really, except we had to do semen extraction since he had a congenital defect...but his swimmers were fine. I turned up pregnant the first time, but we did IVF instead of IUI.
I think different women respond to different medications. I stopped responding to gonal-f and puregon but had a great response with Clomid + HMG Lepori, which is basically cheap Menopur ($15/vial) that I got from ivfmeds.com. I got pregnant three times on that combination (2 m/c's, 1 baby), but that' me.
I used menopur together with Gonal-F; that is a very common protocol. I rersponded well. How well did you respond to Gonal-F? Gonal-F is just FSH hormone while Menopur is 50% FSH and 50% LH. If you responded well to Gonal-F Menopur is just a variation on the same theme.
I hope higher dosage works better for you.
p.s. You may want to post your Q on Fertility forum. Lots of injectables experts there :)