I'm not sure why winny is so nasty on my noggin. My best guess (and remember, it's only a guess) is that because it's DHT-based and 5AR blockers like propecia can't touch it, it gives the guys with true MBP hell. But also, because it's water-based and so fast-acting in the blood (i.e. 9 hour half-life) I think it also causes Tellogen Effluvium from all those ramp-up/ramp-down hormonal changes. Therefore, even someone not susceptable to MBP might shed, but someone with MBP will shed and suffer permanent losses as well.
Without a 5AR blocker, deca and tren are supposed to be decent on hair. Deca is hard on follacles, but fortunately it gets reduced to DHN in the scalp (which is easier on follacles). Problem is if you take a 5AR blocker like propecia, these compounds become hair-unfriendly again.
One other passing thought on test and MPB... DHT is a real hair-killer for those prone to MPB, but the combination of estrogen + DHT is death twice over on follacles. When in doubt, I'm going to run pretty agressive amounts of Arimidex to stop aromitization as well as run Propecia to stop the conversion to DHT.