I don't own this game but does the flipper have an End of Stroke switch? If so check its adjustment. I have had this issue before but not on DE machine and found a cold solder joint were the power wires connect to the solenoid. Resolder might help aleve the problem also. Just a couple of thoughts out loud.
Cabinet and what I can see of the playfield looks like it is really good shape.
Hopefully the Walla Walla folks don't beat on stuff.
I agree 0.25 it is not going to cover keeping it running and your time; especially if location split.
As for changing pricing from 0.25 to 0.50 this is a horrible idea and it is almost always met with a negative customer reaction. I used to have an arcade and believe me it is easier to come down in price later but going up is a turn off to any regulars and 20 games its first hour seems like you have some regulars already. As always this is IMHO no grain of salt needed. My location was in Vancouver Wa so not that far from you considering. As far as arcades I would stick to shooters drivers and fighters possibly a couple of the cool 3 or 4 player games because they draw in others to join also. Best two pins they loved the most were TFTC and WW both made a killing even at 0.50.
Best of luck with your location
Have fun and keep gaming