I can't see under your plastic if you have a wire rail to the right of the down-ramp into the saucer.
I hadn't had much trouble with mine lipping out of the saucer but it had happened to me in a tournament on a machine with a CPR playfeild that didn't have the lone-wire sticking up.
On mine, the ball comes down the ramp and there is just enough room between the rail on the right & the solid washer on the left that slows it down some.(arrows in yellow)
Then I JUST added a 2'nd rubber to the plastic post the cattle gate screws to so it sits lower than the first. Between the rubber post and washer slows the ball some more. ( arrows in Red )
Between the double rubbered post & the lone-wire there is just enough room for the ball to enter (arrows in blue)
With a small rubber on the lone wire as you have and my double rubber the ball get stuck there. it also gets stuck when I tried stacking 2 small rubbers on the lone-wire with a single rubber on the plastic post (which I tried first)
For the ramp at the tube entrance: somebody was missing the grey posts and I made an interesting discovery, posted here. https://pinside.com/pinball/forum/topic/xenon-gray-posts#post-4344849
Quoted from Zablon:
I have mine set up with the clamp on the end as well and I do not have issues with the ball bouncing out. I was going to comment on the rubber, but apparently it was doing it without it. I don't really see any reason you are having this unless it is a pitch thing. Mine is pretty flat.
The wire on the ramp is cut short (probably broke at some point). It should curve back into the slot so the ball just pushes on it both directions. What I did was make my own to put in there (stole it from the coin door mech).
My upper switch wire broke as well & I did the exact same thing, used a wire from a broken coin switch
Xenon left sauser (resized).jpg