aromasin, since its a suicidal inhibitor, will not cause a rebound. E is made ED. Aromasin half-life is 27 hours. dosing it EOD would b like doing 1 shot every 2 weeks of test. levels will rise and fall.
I believe sides, in testosterone replacement therapy (TRT) and cycling, are caused from fluctuations in blood levels, not so much the level itself. This is why its common for guys to get acne in post cycle therapy (pct), levels are changing.
Its kind of like puberty, when your levels are up and down all the time and you get sides.