We are the largest Centurion dealership in the world and haven't had a single customer of ours hydrolock a boat. I have heard it is possible to hydrolock one if you are just running stock ballast, but I imagine we would have seen it if that were the case. Every hydrolock issue I have heard of is from guys running additional weight AND having people sitting at the transom which sinks it even deeper in the water. If you aren't running additional lead you shouldn't have a problem, though I wouldn't let the boat sit for a couple hours fully ballasted. If you are running lead it's simple - just dump Ramfill or PNP at the rear before going swimming and you will be fine.
Welcome to the only downside to a boat that can pack 5,000+ lbs of ballast.