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They did measure estradiol in one of the studies. Unfortunately this particular report doesn't quantify the results. It just says:

Testosterone treatment of men with testosterone deficiency usually increases serum estradiol levels, and may increase hGH and IGF-1 levels. Estrogen is known to potentiate secretion of hGH and IGF-1 levels. Enclomiphene citrate increases serum estradiol levels.

Without the numbers we don't know if the increase is simply due to higher testosterone, or if the aromatization rate has also increased. For me, using enclomiphene does not seem to have increased the rate of aromatization, but it's too little data to be sure.