rudder rake:
From my experience raking the tip of the rudders forward takes away weather helm, and if you lean them too far forward, lee helm kicks in. I have a home built v bottom boardless cat that follows these principals. Raking the mast all the way back wouldn't counter the lee helm caused by having the rudders raked too far forward.

For the grip examples, try the online store here, or a place that has a windsurf and kite section. i think some boom and deck grips are pretty much the same, but the thickness and texture vary.

Of course when sailing with your rudders partially down that handle you have looks pretty useful.