Nah osu!tp has nothing to do here, because that's an average of aim and speed. At the moment of picking maps we aimed for aim rather than speed since we're interested on people showing their better skills instead speed only, like deathstreams or something like that (I'm not saying osu!tp's speed is based on streams only, ofc). Maybe balanced level maps could fit better but it's hard to find something like that which can fit on the pool.
Example, Rin's map is level 78 because it speed only (84), some of the other maps (tiebreaker included) are based mostly on aim. You probably can find a level 40 map there, which it could be harder than a 60 one, just because in terms of skill: aim >>> speed.
Not sure if I'm right or not but that's my point of wiew at least.