SERMs block specific estrogen receptors, some of which increase the rate of steroidogenesis, thereby leading to an increase in estrogen.
As for the AI's, they decrease the enzyme necessary for estrogen production. They're pretty much the opposite of finasteride. Testosterone has two metabolites: DHT and Estradiol. You take a 4-azasteroid, you decrease DHT and increase estrogen. You take an AI, you will decrease estrogen and increase DHT. In the case of AI's, however, the decrease in estrogen causes a positive-feedback loop, increasing testosterone levels, which leads to a dose-dependent increase in both DHT and Estradiol (both undesireable). You can see this in the Baylor studies on 6-oxo. Like I said in my last post, adding more to the equation (i.e. self-medicating) is only going to lead to further complications.
I strongly recommend talking to the doc, perhaps look into decreasing the dosage. Decreasing the dose is going to accomplish the same thing as your self-medicating ideas are trying to accomplish, but without taking more crap. If a lower dosage isn't giving you the results you need, you might be able to compliment it with a topical, as the drug should make you more responsive to them.