The only reason to drill finger holes deep is because the center of gravity is too far below your mid-grip. It isn't actually called top weight, although that is an accurate description of what it is. If you set a ball with the middle of your grip straight up, there are 6 sides that have a weight restriction set by the USBC. Each of the three sets of two sides must be within 1 oz of each other with a .1 oz variance. This means that the left/right finger/thumb and hole side(top)/opposite side must be within 1.1 oz of each other. In the old days, static weight mattered enough that they made these rules. Now it means almost nothing, but the rule is still there, so we have to follow it.
When bowlers start out, the pro shop guy will do a generic layout on your equipment to make it easier on you to succeed. To tell you the truth, neither of yours are generic. I really think that you would be more successful with a different layout. This is easiest to do by buying a new ball, but if you want to, you can plug the fingers and thumb on your sanded ball and try a different layout with it. I would suggest a pin above your fingers to add length, but make it a 5.5" pin from your positive axis point(PAP). This may not mean much to you, but your pro shop guy will understand. The reason I suggest this layout is because that ball is more aggressive than you need. Since you barely use it now, it isn't a big loss, but it could be a big gain. The farther the pin is away from your pap, to an extent of about 6", it will smooth the transition of the ball into it's hook phase. This does two things. First, it makes the reaction of the ball much more predictable and controllable. Secondly, it will take away a lot of the over/under problems people have with high flare layouts. I personally have about 12 balls with 6 different layouts on them. My favorite layouts are 5" pins above my fingers and 4.5" pins below my fingers. Every one is different, but from hearing the problems you are having, I think a longer pin and maybe a 4000 grit coverstock on your sanded ball would be much more beneficial to you than having it ready for dry lanes that you don't usually encounter.
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