Yes, a glass bed job over a factory installed pillar job should improve the action connection to the rifle.
What rifle?
Will this help fliers depends on the cause of the fliers. Depending on the gun, best results seem to come with bedding the action, the lug and 1-3" in front of the lug(chamber area). Then with a factory tube, the next step would be to add touch point to the barrel at the tip of the stock. Shoot it without this barrel touch point first.
Then, if still not ok for you, it is probably time to either recrown or put money into fitting a new barrel.
