If the clamcleat is stiff or keep slipping give the depower line a really good wash out as if it gets sandy it will be hard to use and wear out the cleat really quickly.
There was a mod where you flip the cleat over, made it slightly easier to use. Another mod involved getteing a SS mickeymouse swivel, running a new line up to the swivel and back down again and using the cleat upside dowm, similar to the new Naish Smartloop bar.
I tried all these mods with my 06 Sonics - even made my own bar with different cleat and Slingshot stopper coz I didn't like the GK bar but the Best mod I did was to ditch the bar all together and buy myself a 2007 Best bar
If you go the Best bar route, You'll need 15cm ish extensions on the rear lines
Jay