yup to the resistor "bandaid" too.. which isnt a bad idea really either but its probably a real good idea to at least look at what kind of voltage is being fed there. in my much simpler sentinel "demolition derby" I'd installed a right flipper mechanism (stock theyre mechanically linked to the same flipper solenoid, ewww!) and put in a very comparable coil, same line feeding it but it hit MUCH harder than the left, so in with a 20w 3 ohm resistor was just about right.
noticed it even more in another sentinel I'd repaired with fatter bridge rectifier and power transistor to the pf channel, not more voltage but it hit harder having more current being fed out. maybe another possible idk, are both coils being powered up instead of primary-secondary power swapping with the EOS switch? something like that might make one flipper "all powerful", maybe get a look to that same time.