Loosen the broadhead up and turn the washer 1/8 to 1/4 of a turn. Re-tighten and spin test the broadhead to see if there is any wobble in the broadhead. If there is still a noticeable wobble turn the washer again. You will find a spot where the broadhead spins true and only then will it fly right.
I switched to NAP Spitfires for next season and every one of them spun true out of the package and all of the ones I weighed were exactly 125g. The weight is a pet peeve of mine. I figure that with the amount of money we spend on a broadhead it should weigh what it is supposed to weigh.

I have seen them off as much as 5g. I know that the effect on flight is negligible, it just annoys me. I guess I am just a little AR.
Bob