I haven't seen too many cases of this, but my working hypothesis is that its caused by a fear of leaving a big split. When playing a very direct line to the pocket there is very little room for error as to get a strike the ball must hit high flush. Not high enough and you leave the 5 pin. ( and maybe the 7 or the 10), Too high and its the 7-10, the big four, or some thing else that's big and nasty.
Possible solution is to get more of an angle to the pocket.
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