A little insight into how badly Humans fare at high TV - they have NEVER won a major on FUMBBL:
http://fumbbl.com/help:FUMBBL+Major+Tournament+Winners
(I note that no undead sides of any kind have done it either, also a victim of skill access, see below)
I'm of the opinion that they are victims of power creep - I'd love to take the nerf bat to a lot of rosters to reign them back (0-2 Black Orcs on the Orc roster, for example), but it's probably easier to pimp the Humans slightly.
One of the things they lack at high TV is wide enough access to Strength and Agility skills - this is where Chaos and Dark Elves do so well, as they just keep getting better beyond 2000 TV.
I'd be happy to see the Catchers get Diving Catch (it's a skill designed for Ag3 catchers imho), or a Str boost, or beef up the Humans in other ways with a 0-2 Blocker positional (maybe lacking skills to start with, but that's an extra 2 players with Str skill access) instead of two of the catchers. Av8 will be a marginal improvement - ask Slann coaches how well Av 8 works! - though it would certainly help with the way I use them, as harassment players.
The thing I like least is that very few teams pass the ball - it's basically Elves and that's about it, apart from desperation plays. This is why I favour the Diving Catch idea.