Without looking at what the program websites say, it's hard for us to be sure, but I would guess that GRE-blind means they won't consider GRE scores as part of the admissions process at all.
my take is that practice tests as early as 1-10 are not going to be useful to you. you're unlikely to do all 87 PTs anyway, so just start with the 40s if you're worried about running out of material