I usually run 4-andro as a test base, arimistane as my AI, and follow it up with a strong over the counter post cycle like K1ngs Blood and Rebirth based on the suggestions from the boys at strong supplements and I've never had any issues so far as far as recovery.
I save a little bit of my estro strike (arimistane) for rebound control after completing my PCT and it seems to do the trick just fine for me.
But then again, I'm not someone who is sensitive to estrogen or prone to gyno so although this works well for me, it might not be the best route to go for EVERYONE.
If you are someone who is gyno prone or estrogen sensitive, then having an AI like Letro on hand would be very wise as Epistane and Tren are two of the compounds that have had the worst reports of flare ups while on cycle or rebound gyno when coming off of PCT.
I've heard of people having good results using LETRONE by Black Lion instead as its not as suppressive and works sufficiently enough as an AI depending on the doses you are running your epistane at.