If you cut the POW grip off a stock that was balanced for it, you throw the balance point several inches forward, into your left hand. You can add lead back into the hollowed out stock to move the balance point back out, but the moment of inertia may/may not be the same afterwards.
If you want a straight grip gun, look for one.
I'm surprised no one said, "Look, You are paying for time. Some peoples time sells for more, or less than others."
Another point, since I have a few guns who's stock heads were beaten to mush, More bearing surface, more interconnected wood fibers, greater strength. Lasts longer. Less likely to snap off. Excess hogging out of material in the interest of speed increases risk of breakage.