Hey John,
Yes it does help stabilize a ball quite a bit. I've drilled many this way to help combat typical O/U shots but be careful, they can clip the holes if you're typically a higher track player. It even changed inverted tracks to full rollers on some of the higher tech balls.
The "reverse" flare you guys refer to is and was the "original" track that balls use to roll (plastic/urethane..remember I'm old)
. It was due to the high tech blocks that cause a ball to actually flare or pull downward. So by placing your controlling weight on the "other" or negative side of the ball, it's pulling up vs pulling down.
Imagine placing a ball bearing in a baseball, by simply throwing this baseball with the ball bearing on one side or the other, it'll pull towards gravity, right? This is the same effect in a generic sense of placing a weight block from one side to the other. Hope this helps...
--------------------
Rick Leong
Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff