Masters I know we don't have this information for: Shirou, Rin, Sakura, Kirei, Kayneth, Ritsuka, any of the Crypters, Ryuunosuke, almost all of the Apocrypha masters...
Who we do: Waver and Caules.
"Standard measuring stick" my arse. It's a lot rarer than it is common. It's completely useless for working out much of anything due to being so rare and inconsistently applied.
And Strange Fake is completely unimportant to anything ever.
I have no idea why you went for the weird quantity/quality letters because those never came up outside of Mahou Tsukai and... honestly even if that wasn't a tiny reference pool the examples are super weird people anyway. They're so little used they literally don't mean anything and are just confusing.
Like... I have no idea what you're supposed to be implying without describing it. Average? Above average? Good? "Somewhere between Aoko and Touko but more" is big.
He also has to violate literally every principle he holds to get that sort of buff and he can't engineer the situations too easily to access it. Hell, one of the conditions is basically fighting people that aren't worth it. It's powerful, sure, but it's not like he can just flip a switch and get it all.
See, that's weird, because we also know A+ strength is the literal limit of what a human body, even a Servant's, can do due to Natural Demon. So for sanity's sake it's pretty simple: if he keeps proccing buffs like a madman he's stronger than basically anyone that can show up in this war and we don't need to care what the exact stat is. :p
I... guess Jubei is okay? I absolutely hate that agility but Munenori has it for no fucking reason whatsoever despite being an old man who keeps sitting down. God that's dumb...