My 2 cents:
It's a great fallacy that a "weaker" ball will not hit as hard or will have worse carry power than a "stronger" ball. I found that to be a fallacy, and old wives' tale. It depends more on the correct use of the ball as well as the drilling and the bowler's hand, just like it does for any other ball.
Recently I did what you're talking about with a Lanemasters Sure Strike. Its normal use is like the Playmaker abd Psycho: meidum oil. I did it because dumb ole Lanemasters doesn't make many "weaker" balls. So I put the pin over the center of the bridge and the CG just below it, slightly kicked out, maybe 1", no weight hole. Now the Sure Strike is known for its incredible hitting power. SO I figured it was a cinch to carry.
Recently I also drilled up an Ice Blue Power Groove pearl I had sitting around for the lonngest time. I put a more normal drill on it. I wanted them both for the same medium light oil pattern. I actually got a better overall ball reaction from the Power Groove than I did from the Sure Strike.
Another Prime example is the Visioanry Blue/Green Centaur. This has to be one of the "weakest" balls ever made. Its flare is less than that of a pancake core, approx .015". Yet few balls made today have better overall carrying power. Pins don't go flying around like they do with many new balls, but they fall when you and anyone watching never think they would. I've had friends say things like, "I never thought that ball would hit the headpin, no less carry everything." Pins just can't seem to wait to fall down when they see this thing coming at them.
Personally, If you're trying to weaken a Playmaker or Psycho, I sincerely wonder if you wouldn't be better served by drilling a Cherry Vibe, an Emerald Vibe or a Clash normally.
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