Usually if a gun bites, it needs a little more negative pitch, start by putting 1/116" x 1" spacers under the top screw of your butt pad & increase by 1/16" increments if you go beyond a 1/4" it may be something else.
Is Phil right about the definition of "bites"? Is your cheek being bashed by the comb ("cheek slap")?
If he is, Phil is describing is the correction for the stock dimension known as "pitch", in this case, increasing the pitch. The pitch is correct when the entire recoil pad, top to bottom, makes simultaneous contact with your shoulder pocket as the gun is mounted (with the top of the pad, the heel, on your collar bone).