Use Aromasin.
I keep letro around in case I need to kill estro quickly.
Running letro with that low Test dose is asking to crash estrogen.
If you have not run Letro before but are determined to use it, I would definitely dose it low...maybe even lower than HI recommended.
I'd still recommend something for Prolactin sides. Caber or Prami...preferably Caber.
With research liquids as opposed to pharm grade tabs, sometimes you buy it to have it on hand and you pitch it when it expires, whether you've used any or not.
The point being, you had it in case you needed it.
BTW: How prone are you to gyno/estrogen/prolactin sides?
How often do you get labs?