I've seen a Robinson test pilot demonstrate low G (he has earned it, being a super-pilot with tens of thousands of hours).
No big deal---this used to be a required maneuver on the FAA check rides, it was only removed in the late 90's I believe.
So in order avoid legal liability for busting a TFR, you HAVE to call FSS.
This will not protect you either----not all FSS are operated by the FAA. I know of a pilot who did call and was still busted.....beware of contract flight service stations---they are also not subject to FOIA rules and can get out of giving you information.