HCG dosage depends on a few things... including the time lapse of an sufficient LH/FSH signal.
Did you get your LH & FSH levels checked?
BTW, since insurance is involved, I highly suggest inquiring and urging for HMG treatment with the HCG. It can reduce desensitisation.
Also, an AI such as Adex, letro, or aromasin would be a better choice than clomid or nolva.
-Pp