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How much testosterone are you on? How often are you administering? How much primo are you using? What is your current hematocrit? What does it trend at? Are you hydrated when your blood is drawn? How low is your estrogen? Are you experiencing any low estrogen effects? What do you expect from an elevated estradiol?
Some low hanging fruit: improve your hydration, your ratio of testosterone to primo may need to change regardless of HCG use, these numbers can fluctuate depending on your goals (long term cruise, off-season growing, cutting phase, etc.), and your overall health is more important than a handful of transient metrics on bloodwork.