my guess is that the increased extra Test, with nothing to put it in check, lead to more DHT conversion. Simply put, more test, more DHT, more hairloss in folks genetically pre-disposed.
I control DHT with Proscar/Propecia. It has been a miracle worker, as I actually regained some hair I lost on my crown, and kept what I had. I only wish I had started it sooner in life!
Most folks tolerate Proscar/Propecia (finasteride) pretty well. Some folks, it makes their libido go to hell. I have not had that side at all, thankfully.
Most folks will at least maintain their haircount on finasteride.
Avodart (dutasteride) blocks even more DHT conversion, and has a longer half life. So, it's a stronger compound, BUT, some folks have gyno from it (yeah, almost 0% test to DHT conversion, so more of the free test converts to estrogen) and have the loss of libido.
I never used avodart because proscar was such a success. I think the pills are more effective than minoxidil topical, but just try both.
On cycle I'd recommend running finasteride if you are prone to hairloss. Unless you are doing deca, in which case finasteride messes with it (google it).
Stay away from dbol, masteron, abombs for sure. Killers on the hair, I've read.