Charlest, you could be right and probably are, as you normally are, but I disagree. Why would a person want to for example: Drill a Super Carbide Bomb "Stacked Leverage" for heavy oil and then drill all of the other balls they have, all "Stacked Leverage?" Some of those balls are going to burn up too early and roll out on the conditions they are being used on, or hook at the wrong place, or break too hard and etc. Some of those balls are going to need maybe drillings to go a little longer, rev up earlier, more angular on the backend, less angular on the backend, and so on. Stacked Drilling on every ball you own isn't going to give you that option. I'm not a knowledgable drilling expert by any means, but I do know that the same drilling on every ball I own isn't going to get the job done for me.
For a good example of what I am trying to say here, Doug Sterner posted 6 balls and 6 different drillings for 6 different conditions under Lane 1 today.
It makes sense to me to do this, but as I already said, I am no expert at this and could be wrong.
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In the old days, they used axes to chop up wood...Nowadays, they use "BUZZSAWS".