More angle = more catch & more power BUT you will tire quicker and it make the blade harder to control , the average blade offset is around 12 -14 degrees.

You want all your power at the front of the stroke with a clean exit at your feet when you pull past your feet you are starting to lift the water and not drive it back. Reach out at the front of your stroke and apply all the power there you will notice a big difference straight away.

Piros

Kialoa are traditionally 10 degree off set with c4 and werner being similar. increased off set will tend to soften the catch but will also increase the downward angle of the water at the start of the plant and will tend to increase resistance more through the back phase and exit of the stroke.
this being a paddle with 12 degree or more.
Kia Kaha paddles are set at 8 degree which tends to increase the power at the plant phase and helps with clean release at the exit phase stroke which are both equally important.
remember that you are not yanking the paddle past you you are setting a solid plant at the front and pulling you self and the craft to that point then exiting the water cleanly and allowing the hull to do what it is designed to do (slide).
Good Plant +consistent power + clean exit = solid technique and more fun.
this seem to contradict some of the other views on the topic, take from it what you will but 20 years of single blade experience hopefully counts for something.
a paddle is an important piece of our tool box just make sure it feels good to you and you get plenty fun out of the thing.

Kia Kaha

Cheers for the replys...been working on some wood paddles and was just wonding about the balde angle after seeing some OC paddles and looking at some videos on youtube