I am continually confused by how easy it is to gain strength and muscle mass now that I'm running on testosterone. Like, I knew it was going to be easierer but this is ridiculous.

That must be fascinating! Mental Meatheads did a really interesting interview with Mace Clinkenbeard (coiner of the term "fitness-industrial complex" where he talks about the differences in his training experiences after he started on testosterone:

http://agogefit.com/mace-clinkenbeard/

Yay shoulders!