Agree with Gene, there's just too many variables to make it a simple answer. If your E2 sensitive is at 19pg, I probably wouldn't even mess with an AI, but that's just me. Keep in mind, the body is constantly trying to achieve homeostasis. Look further upstream as noted by Gene .. Look at DHEA, pregnenolone, thyroid, cortisol, and D3. In my case, I haven't had any AI in close to two (2) years! Don't need it.
IMO, you might be putting too much emphasis on testosterone to be the one trick pony. As you've stated, you've been battling E2, yet at the same time you have "upped" your protocol dosage of cyp, and you are looking at a 400iu EOD of HCG. At a glance, that's just going to contribute back to the same pattern you have already been experiencing, where E2 will climb, more AI gets introduced, etc., etc., ...
What "if" you could lower your test serum, stabilize and optimize estrogen serum through other pathway channels from precursor hormones like pregnenolone and DHEA, and balance other variables like ATP, GABA, energy, etc., stemming from the thyroid & adrenals (cortisol), and other hormones & supplements, e.g., D3, B12 Methyl, Omegas, ... (?)
