Hey there,
Thanks for putting up this post and sharing the informations: i have recently had exactly the same problem on my Funhouse, after not a single scoop worry in more than two years of ownership.
But recently i found that the eject power was much less strong and worse, the ball started to hit the right slingshot...
just like you did, i tried everything: took the mech out, gave it a clean, checked that everything was right, even re-soldered the coil just to be sure etc. but same result.

Then i saw your post and so tried to simply take out the AE-26-1200 coil and replace with the more powerful AE-25-1000 and ... bingo: perfect shoot out of the scoop again!
Powerful, straight to the right flipper... “just like in those stream videos”.
It felt alive, good, strong: just the way you’d want it to fire!

So, very happy about it and a big thank you for sharing your solution: it worked wonders for me too!