the "sweet spot" for epi is normally 40mg. of course, every "body" is different. someone sitting at 150lbs may need less, someone at 235 may need more.
I am not familiar with xtren. Did you mean xtreme tren (19-Norandrosta 4,9 diene-3,17 dione) From what I've read, xtren's doses range from 50mg and up.
good luck
PCT would be the same for these compounds as they would for any other. I'd run Tamoxifen Citrate (Nolvadex) at 20/20/20/10 (some people go 40/30/20/10). I'd also run a testosterone booster such as TestoJack100 by NOW (very inexpensive) or DieselTest by Get Diesel (pricey).
Some folks use an AntiCort, but I'm not sure which one to use or if even if they do anything at all. ADT or 6-Bromo are popular aromatase inhibitors that can be run INVERSELY (ramped up) during PCT, but I don't bother. I'm not into the "everything but the Kitchen sick" method of PCT. Keep it simple.
-e