Fish head, I have bedded quite a few of the injection molded stocks and have never had a problem with bonding to the stock and I don't drill holes in several directions. Remove enough material to insure an adequate thickness of bedding. Clean out all the sanding residue. Wipe the area to be bedded with a good solvent, I use acetone, and don't touch that area with anything but bedding material.
To stiffen the fore end I bed a small aluminum rod the length of the fore end. Adds very little weight and really stiffens.Rick.