If you're honestly worried about it, I have some field points that I will sell you. They are 106 grains on the nose.
Only $5.00 per field point.

Just kidding...Im gonna have to agree with the others though....6 grains, while upsetting to know, is actually very little in the world of arrow tolerances. You arent going to notice a difference.
If it makes you feel better, find the heavier nocks, and put them on the bh arrows, and the lighter nocks on the fp arrows.
Then go out and practice.
have a good one---Matt