There's really a problem with Aby "aged" Warlocks and Anathemants, they die like flies and, given that Warlocks are capitol-only I can't even conceive how you can start a Blood economy with them.
In my test game, even with Growth-1 I had 3 mages diseased by turn 13...OTOH with Shinuyama and Death-1 scale I had only 1 Sorc out of 8 diseased by turn 20 ! Looks like a problem with "old age" at a low value 35.
IMHO in these conditions Aby isn't playable competitively at all and even in SP it's not fun
And don't tell me "yeah, just cast GoH and make boots", Aby isn't supposed to cast GoH, and boots don't cure disease !