Risk assessment.

Ha, depends how much of a murphy proponent you are. Given a long enough period of time, I'm going with 100% as well. When I was using an autofeeder, I built a small box out of 1/8" acrylic that surrounded the hole in my screen. Light enough that it didn't deflect the screen and never had a fish get through.
 
Take a plastic milk jug and cut it into a rectangle. Use a butane lighter to warm it enough to bends it. Make a square tube that can be zip-tied to the screen cover. If they jump they will hit the feeder and fall back in.

Yeap what I was going to say.
 
Once they learn where the food comes from you increase the chance.

You could try putting a tube or cylinder, think plastic bottle with top and bottom cut off, on top of the screen under the feeder. If it's tall enough, like up to the feeder, you limit the opening. May not look the best though.
 
I run an auto feeder as well along with a screen top. But I only feed pellets and chips.
I can see the need to make the cut to allow for flakes to fall in. But this is also one of the reason why I don't feed flakes. I do have flakes, but I only feed it manually on occasions when I'm home.

What I have noticed is that at feeding time all the fish gather and circle around the area where the food is dispensed. This sometimes leads to fighting and in some instances I saw a fish launch upwards in the same vicinity. Either it was so excited and couldn't wait for the pellets to drop or another fish took a bite at him to get out of the way.

Point is, if you have an opening in such an area, then anything is possible.
 
I have that feeder and a screen top. I have feed flake, but I simply smash up the flakes so they will drop through the screen. I know this is too late, as you have already cut the screen.
 
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