Planing the bridge is a way of avoiding a neck re-set. It changes the "leverage" exerted on the guitar top and can compromise both tone and volume. I do it as a last resort on instruments that are not valuable enough to have the reset undertaken. HD 28's are not IMHO in that category. I doubt that a 1994 HD28 requires a neck reset. If it did, I'd send it back to the maker with a note of complaint -