To add a few things...
A pin placed at 3 3/8 inches from your PAP is the leverage position.  The core is in a position of maximum instability and you get the most flare with that pin position.  As you move the pin closer to your PAP, the drilling is becoming a lower RG drilling and losing flare potential.  Pin on PAP is the lowest RG drilling and should result in virtually no flare.  As you move the pin further than 3 3/8 inches from your PAP, the drilling is becoming higher RG and losing flare potential.  When the pin reaches 6 3/4 inches from your PAP, it should be in your first track and this is the highest RG drilling and should also result in virtually no flare.

Low RG drillings promote early roll, and can result in a ball rolling out and hitting flat if used improperly.  Polish can help if that happens.  Sometimes, in spite of the drilling promoting early roll, the lack of flare potential can cause the ball to get down lane pretty well anyway, depending on the surface.

High RG drillings promote skid and more of a snap on the backend.  They can also make it difficult to control the breakpoint by overskidding.  Scuffing can help if that happens.  The lack of flare potential in these drillings also promotes skid.

I don't like high RG drillings personally, but that's because of my game.  Bowlers with higher rev rates than mine tend to do better with high RG drillings.

Shiv
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Listening to the monotonous staccato of rain on my desk top