Raise the action, and play closer to the bridge. If that doesn't quite do it for you, you'll want to pick up a set of heavier-gauge strings--I've got some realloy heavy strings on my bass, I can play as hard as I want with no clicking. Plus they sound better IMO
-Dash
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Current rig: Gretsch G5123B + 2x Fender MIA Jazz basses -> GK MB Fusion + 2x GK NEO 4x10s
...and a constantly changing pedalboard