From comparing Nicks video to my video - does any one else think that his coil is being held in for longer?
Not that I can see, In Nick's vid the ball is actually flicked forward when the gate opens, with yours it flicks the ball back < thats your problem right there.
Why have you removed the upper wireform from the lane on yours?
Mine was different to Nicks...(didn't have the 90deg bend at end) and just stopped short of sitting inside the hole in rail. So about 50% of the time the actual wire would stop plunger from moving. I did look and it wasn't hitting the ball at all (ie helping it move on).