I broadhead tune as described in the Easton tuning guide as my last step before hunting.

Shoot a group of FP's and then a group of BH's. Compare the groups. Your up and down you can adjust with knocking point. If they are low move the nock down, if they are high it is the opposite.
Your R and L adjust with the rest. If hitting right move the rest to the left, if hitting left move the rest to the right.

Don't try and fix both at the same time. Do one and then the other. It takes a while to do. Move the rest and then re sight in with the FP's and then shoot the BH's. They will get closer every time until you find the right spot. Then go on to the up and down. Usually take me a few days as I get tired before I get all the adjustments made. The BH's will really let you know when your form starts suffering.