Quoted from Neal_W:Slightly loosening the screws that support the middle of the ramp gives it a little wobble/flex, which absorbs some of the speed and helps somewhat.
Thanks for the tip. I'm going to reinstall the OG coils and see how it plays. I was having the right flipper flutter occasionally, and thought that maybe it was the coil, but it turns out it was the flipper switch. Now that it's sorted out, I'll have to see how the OG coil plays.