You can always move the transformer wire to high tap if you want more oomph. Personally I'm not a fan of the hot coils if the flippers are rebuilt, everything is clean and you have at least 120V at the outlet.
But the hotter coils are just less windings (lower resistance) than standard coils. My Target Alpha came with the yellow dot coils and a bunch of broken targets and plastics that had to be replaced. I put the standard coils in and it plays just fine. EMs aren't supposed to play like Iron Man.