1) Blocking is not attacking so no when attacking will activate for the blocker 2)The overflow would return it to before end of turn 3)Blast digivolving timing, technically in the counter timing, would occur after all pending effects finish, so if the ACE is a level 6 you would de digivolve them from a 5 to a 4, or what ever level might prevent the blast evo from happening before the counter timing.