Difficulty mapping controller in Dolphin

[Leatty]

I'm using a gamecube controller and have mapped everything successfully except for the L and R analogs, which are needed to "lightly push" the L and R buttons. When trying to map them, they are incredibly oversensitive. Just barely tapping the L/R buttons maxes them out to 99 threshold. There's no "sliding" at all; the moment I even accidentally nudge the button it maxes out. How do I fix this?