Look down the nock end of the arrow. Which ever way your vane or feather goes is the offset.

I would stay away from Crimson Talons. They are not very durable. I have heard several bad stories about the blades breaking when they were shot into the target.

I had the same problem as you. I couldn't get my broadheads to group with my field tips. They would not even stay on the target half of the times. You can put a good helical on your arrows. This will help stabilize your arrows. You do not want your arrows to stabilize from the front. This will not help with your grouping problem.

You also need to tune your bow. You can download the Easton Tuning guide and follow the rules. You will have great broadhead flight in no time.

http://eastonarchery.com/downloads/ Click on tuning guide.