Erase is ok, but not really a good ai for PCT of a legit cycle. There are two main reasons to run an ai in pct:
1) to lower estro to "trick" you body into making more test (so it "can" convert it)
2) to prevent rebound estro issues as hormones normalize
Adex (non-suicidal) is good, aromasin (suicidal) is best
Personally, i always run mine a little past my serm but start at the latest a week into pct.
Highly recommend reduce XT for cort control as well as this can be a major pain during pct when every hormone in your body is out of whack. I usually run it for all of pct and then another bottle past (8 week run), but if tight on funds one bottle, started at week 2-3 will suffice.