Careful. There should be a happy medium on the adjustment of the EOS switch. If you adjust the EOS switch gap too close, you will often get the pogo effect. That is, if the ball is really moving and one holds the flipper up to try and catch or deflect it, then the momentum of the ball will often bend the flipper bat downward just enough to close the EOS switch, which makes it go to high power, and the bat will then reverse and pogo the ball back up the PF again. If 1/16" works on your game, then fine, but be careful on adjusting the gap too narrow.

Are the return springs set properly for optimal low resistance?

I will "third" orange-dot coils for this era of Gottlieb flippers. If you install them and conclude they are just a little too bit too strong, you can fine tune the action by "winding up" the (clock) return springs by one screw position to increase the resistance, or, can open the EOS switch gap to reduce the power stroke.