1) Drill sheets are very, very generic. Just because a layout isn't listed on the three or four suggested drillings on a manufacturer drill sheet doesn't mean it won't work. And in my opiniont, those suggested layouts actually are so generic that they aren't very useful for most experienced bowlers really.
2) The placement of the pin in relation to the fingerholes means nothing. What's important is the placement of the pin in relation to your PAP, the axis point that the ball rotates around. This determines how the core is actually positioned in the ball for the way you roll the ball. Someone else could throw this same ball and get totally different results.
3) This layout isn't all that uncommon. You quite often see the pros on TV throwing equipment with the pin over the middle finger when the heads are drier.
4) Depending on your PAP, this layout could range from a medium flaring, moderate lenght layout(if your PAP is less than 4 inches across from grip center) to a low flaring, length-then-snap layout (if your PAP is over 5 inches from grip center).
Don't worry about how it looks, worry about how it reacts. If you have a fairly standard PAP (in the 4" to 5.5" range), this ball will "go real long and snap hard on the backend."
