I don't really see this as a problem.
From R35, last bullet point at bottom:
Quote:
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Bumpers must be positioned on the robot so that they remain between 2-1/2 inches and 8-1/2 inches above the floor
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Even though what you said was right, the overlap is big enough, I think.
The bottom of the bumper, covered with smooth material (required in the bumper rule) should not catch the balls. I think it'll be low enough to not cause problems.
Just my take on it.
JBotAlan