Interested in hearing responses as I reckon mine were weakish and have tried this recently to improve their performance. I bent outwards the main plate assembly that attaches the flipper mechs to the underside of the playfield. Only a slight adjustment made where the coil stop sits. This should provide a little more travel in the flipper bat arc. I played with the eos and set it a fraction too late in opening and just blew fuses.

Make sure you have the correct coil rating as well