"The next step would be where you see the guy hitting right around the edge of the heated area "Pushing" metal into the most heated area. "
THAT is exactly what a serrated face shrinking hammer is for, better traction for glancing hits to push the metal into the heat. They are definitely NOT for on-dolly hits trying to waffle the metal. No need to throw them out, just use them correctly.
I would suggest you search the web for Martin Hammer's how-to booklet, lots of good stuff in it from the 1930's.
Be careful shrinking, most people go too far with it.