The 60x figure is from a YouTube video I saw weeks ago, explaining how to achieve the best results with sneaking. Although I don't find this number in the game, with the Shadow Warrior perk, you can basically use 30x sneak attacks repeatedly.
That the armor cap is achievable with both armor types was exactly my point: They are too similar. Maybe I only didn't find the stamina regeneration useful because of my Respite perk in Restoration, but there are so many ways to regain stamina, I see little value in a 50% regeneration bonus to allow for a unique playstyle with light armor.
Don't be sad if this is your first Elder Scrolls game and you enjoy it. It
is an amazing game, but that doesn't mean it couldn't be better in some aspects.

Oh I wasn't trying to insult your findings. Unless you've spent hours discussing the game mechanics and picking apart the game I totally see where you could think 60x damage was possible. I certainly thought so until I stumbled across forum posts after having played through the game once.
Yeah, I understand on armor. Do you know if the steed stone cancels out the stamina difference on sprinting for the different armors? And alongside that, will the perks that make them weightless do the same?
Oh, I'm certainly not sad, I love it! I can see areas that would be nice to have improved, but I love it anyway! For instance, when I run into a room and take out three out of four bandits before they have a chance to draw a dagger, I don't want that fourth guy running at me. I want him to decide to run away to more of his bandit friends, for reinforcements. Then if I let him get away, I'd love for the entire cave to know I'm there now.
Or when somebody pleads for mercy, if I could sheathe my weapon and tell them to get the hell outta there without having to kill them, I'd like that. I wanted to do a playthrough where I was mostly a good guy, similar to Luffy. Kick ass, let them go if they apologize sorta thing. Unfortunately I found it to be impossible and had to do killing here and there.
Regardless of these things I wish I could see though, I can still see the game is awesome, and well worth my $60 even if it means I've gotta take it easy on the beer for a few weeks : ).
But OP! Look at my original post again, I posted something specifically for you!