You don't say what size shafts you're shooting, so this is just my educated guess.

If you're using 23/64" shafts and heads with 11/32" ferrules, you will always get a ring of raw wood at the top edge of the head. Can't be helped. It's absolutely fine to shoot them like that. Only problem with it is cosmetics. I just take a magic marker and put a cresting ring over the raw wood.

You can't do anything about it with broadheads. Whatever size ferrule they're made with, you've got to use 'em. With field points you can get 23/64" heads, but the outside diameter of those boogers winds up just a tiny bit bigger than the diameter of the shaft. In bag targets, they hang up in the cover fabric and cause fits of extreme naughty language.[:@] I file a chamfer on the outside back edge of my field points to make them flow smoothly into the shaft diameter and prevent hangups in targets.

Just to expand on Chad's comment... I wash out the ferrules on all my heads with acetone, to get rid of any machining residue or preservative oil. Then I take a short section of arrow shaft -usually one I've broken[&o]- and put a point taper on it. Then I glue a piece of coarse sandpaper around the taper. I use that to rough up the inside of the ferrule and give the glue something to hang onto. Then I wash them out with acetone again and let them dry before mounting them on the shafts.

It takes some time and effort to do all that, but I lose very few field points in targets any more.