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Knuckleballers get some of the best BABIP's against, precisely because hitters are trying to swat mosquitoes with willow switches, and after that are the guys with change-speed games, such as Moyer.
Radke himself had a .275 lifetime BABIP.
Fister's is .236... can't stay that low, but is an interesting start...
I think when the hitters have to swing at different DEPTHS of the ball, that's when you see the weaker swings... if it's just different areas of the swing, they can haul off and whack at it, hoping to adjust the barrel's location...
But Doogie keeps them off kilter as to how deep a pitch is going to be... the knuckleballer thing hadn't occurred but is very apt...