Chitown,
The best luck I've had trying to control the backend reaction was with balls drilled with short pin-to-pap distances.
I know this will sound absurd, given the coverstock, but I had a granite gargoyle with a 2 inch pin and low topweight drilled with a 2 X 0 drill. The pin lower than the bridge, cg on pap, drilled back to 1/4 oz positive side and HIGHLY polished ( almost had the pin and cg on a line perpindicular to the grip centerline, but the pin was just a bit higher ). I could play the track area with this ball and it NEVER overreacted on the backends. As a matter of fact, I had to make sure and hit the ball good to insure that it finish strongly. Very hard to over-hit this ball.Ball had very little flare and tons of roll.
Had a killer instinct sanded ( but I polished it ) with almost the same drill on it with the exception that the pin was higher above the midline. The cg was at about a 90 degree to the grip centerline and the m.b. was in line with the cg, well below the v.a.l.
This ball was stronger than the GG, but was still smooth as glass ( for me ) and I shot some really good sets with it. Strong but VERY controllable.
I've had a couple of balls drilled with short pin to pap's and the backends seem tamer on those for me than anything else.
P.S. Just remembered. I had one ( original nitro/r ) with a short pin to pap that had a good backend, but it had the cg stacked directly below the pin, like a 2 X 2 or so, now this ball WOULD move, so it may have been a combination of the short pin to pap and the cg being at an almost 90 degrees from the grip centerline.