If your flippers are strong enough to knock down the drop targets and hit those upper kick-out holes, they are probably fine. A little cleaning and EOS adjusting would probably give you a little more. High tapping more still.

The only reason I could think of to buy a rebuild kit is if the holes in your flipper fiber are elongated.

I think your two solid state games might be influencing your opinion of these flippers. Short of converting them to DC, they are never going to feel anything like your other games.

If you go with the yellow dots, you might want to pick up a new set of drop targets too.