Just played a game. The left flipper doesn't really seem weak, but a clean shot from a cradle does just barely miss making it all the way up the ramp. However, I made it several times from shots on the fly.
I haven't checked the game's inclination, but it does look like the front leg levelers are screwed all the way in, while the back ones are fairly far out. Perhaps making it a little less steep would make it possible to hit that shot from a cradle.