You didn't mention your T dose but it is possible that it is too high. What is your blood level of T? If your T dose is too high it is preferable to reduce the T dose rather than use an AI.
By the way, T that is too high itself can cause ED in some guys irrespective of E2.
Hook, no offence, but at 350 mg T per week you are not on TRT. Let's call a spade a spade.