You also have the coil in backwards. Lugs should be away from the coil stop. (Constant vibration can crack solder joints.)
Second, you may not have enough play in the flipper assy. The pawl and plunger should be as straight as possible. If the two aren't straight enough, they tend to stick slightly.
You may want to check out vid's guide:
https://pinside.com/pinball/forum/topic/vids-guide-to-upgradingrebuilding-flippers