There's a PF that allows you to use your DEX when calculating your CMB:
Agile Maneuvers (Combat)
You've learned to use your quickness in place of brute force when performing combat maneuvers.
Benefit: You add your Dexterity bonus to your base attack bonus and size bonus when determining your Combat Maneuver Bonus instead of your Strength bonus.
Normal: You add your Strength bonus to your base attack bonus and size bonus when determining your Combat Maneuver Bonus.
//TODO: Create kewl sig...