Maybe the slope of the lower PF could vary which would change how much screen is visible. I went back a quite a few pages to refresh my memory on the plan for the lower PF (quoted post 834 to help others find it).
Quoted from pinballrockstar:
So this is the rough plan,2 flippers downstairs and 2 pop bumpers.
On the 2 sides,we are gonna make 2 rows of targets,spelling the insert words "crazy" and "mansion".
Lite both words and you can shoot straight down the middle for mental jackpot
Anyway, accomplish something on the main PF to reveal more screen and make the lower PF ready for mental jackpot. Get the ball down there when the slope isn't steep and there aren't many points to be had (so player is just wasting time stuck in the asylum), but when it's steep/difficult the jackpot can be earned. Maybe what's revealed on the screen is icons showing the state of each letter's insert target which is progress toward earning the jackpot.
A mechanism that incorporates a threaded motor shaft running through bolt fixed to the lower PF may be enough to give control of the pitch. The lower PF's exit ball path would need designed deliver to that spring you guys built no matter PF position.
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