Little write-up for those with the right flipper too weak to hit the top right scoop...
After replacing all connectors, shotgunning all boards, rebuilding the flippers with new coils, trying all possible EOS adjustments, reducing the slope to the point it felt really wrong... I still couldn't hit the top right scoop.
I kinda gave up for months just hoping for luck at plunge or lane guide rebound.
A few weeks ago I finished rebuilding my Blackout, only to notice how strong the flippers were. I realized I used the PinballLife complete flippers kit for Williams system 6, and even if they are not the fliptronics style, they are noticeably stronger than those I had in my Firepower (fliptronics style).
So I went ahead and ordered another set of PinballLife complete flippers kit for Williams system 6, mounted them, adjusted EOS, and boom... Instant hit of the top right scoop! I then leveled the rear legs to go back to a normal slope and it hits again, clean and strong.
I am not sure why they are so much powerful? I had the exact same coils (bought individually at Marco a year ago). This older design is supposed to be less efficient than the fliptronics, as it's got the conical spring that chews the link and drags more, but it is night and day.
Anyway, this is the one thing that did the trick for me. It's pricey but really, being in control now is a great feeling.