The portion of broadhead tuning I seem to be missing...

I realize this is better suited for the technical section, but the response time here is much better...

So, the thread I've read over on AT has a diagram (its the sticky thread for those of you who frequent there as well) showing exactly what the author did to tune his broadheads.

I've taken things a step further than I normally do this year and aligned my broadheads with my vanes, I've squared both the nock and the insert end of the saft as well as the insert itself.

I've paper tuned my bow - its shooting bullets.

I step back to 25 yards and my broadheads (Strikers and Shuttle-T's) botth hit roughly 2" right of my fieldpoint. The thread over on AT leads me to think that I need to move my rest 1/16" left until the POI of both the fieldpoint and the broadhead meet. When they do, I adjust my sight.

This is where my brain stops working... If I move my rest to the left, its going to shift both my fieldpoint and broadhead POI the same amount, just shifting the 2" difference further left. Tried it and thats what happened.

What is it that I'm missing?

Yes, I could just sight my bow in for broadheads and be done with it. No, I don't plan on doing so unless I have to. I shoot too frequently to want to compensate where I aim for FP's.