Are the coil diodes oriented the same on the old and new pf's? And the end of travel switches are adjusted correctly? Double check the wiring to the upper flipper. Sounds like the power may be feeding the high resistance side of the coil.

Make sure you have a bit of up and down play on the bats throughout their entire stroke. Also are conical return springs installed with the large side towards the coil? They look a little odd in the picture but that wouldn't be related to the no flip issue.

EOS switches. New switches often have a bit of film or oxidation on them, or don't seat together perfectly well, and that adds resistance. Doesn't take much at all to exceed the resistance of the coil windings themselves. It then acts as though only the hold winding is activated, which oftentimes isn't enough to move the flipper against gravity.
Clean the EOS switches thoroughly with a business card; maybe bend them a bit so there is more pressure holding the 2 reeds of the EOS switches together.

(As a test, you can try flipping with the EOS switches shorted with alligator clips...just be very careful to do very quick flips; holding the flipper button for any length of time will blow a fuse (at best) or burn a bridge or coil. If the flippers are strong in this configuration, that means there is too much resistance in your EOS switches.)

With power off, check the resistance across the flipper coil with flipper in the unpowered position, then move the flipper manually to the actuated position (which opens the EOS) and measure the resistance. Report your findings. Just want to confirm the wiring is correct. You should have low resistance on the first reading, and high resistance doing the second reading. I have seen flipper coils manufactured with the diode backwards, and the installer unknowingly wired to the diode correctly, but that left a flipper that didn't work because initial power was applied across the coil over the high resistance windings.

You have some really great suggestions by the others above. If those flippers were just rebuilt, my bet is the EOS is on the wrong side of the coil.

The pic appears correct vs. my BK - EOS wires going to the left and center lugs (hold winding), banded end of diode going to the other lug (main winding).

Since the new flipper eos switches are high power ones (not gold flashed) you might want to also run a flexstone or very fine file between them a few swipes just to clean off any of the above-mentioned oxidation, may have still been the actual issue. But it will probably just get worn away anyway now that they are flipping.