If you sand the ball with your initial oil track, the ball generally gets more length than if you sand across that track. Then, as the ball flares as it goes down the lanes, the track will migrate to cross the sanding lines. This should add a small extra degree of "bite" or grab due to the friction difference, at or near the breakpoint. It depends on how much the ball flares which, in turn, depends on how much your rev the ball, the pin position and the design of the core.

In my opinion, much more depends on all the other factors, including your "hand", ball speed, the ball and the oil pattern than on the sanding direction.
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"None are so blind as those who will not see."

So sanding parallel with the oil track will produce better backend results?
Now, if I sand across the track what will that produce? Thanks in advance :-)

Thanks for the information !!!