Not really. I've always felt the 10% rule should used with small children and only as a rough starting guide. The truth is there are truly 2 things two understand first and foremost comfort and lack of injury are them most important items. You should also understand at any weight less than 14 lbs. your not getting the maximum you could for your game. Below that weight you are exposing yourself to more generic cores in the balls and you will see increased deflection of the ball path in your game generally carry will be worse.
There are good reasons for lower weight balls at times. You want to be comfortable in what your doing and you want to avoid injury. if your really serious about maximizing your game I would suggest having your pro-shop drill a older 14 lbs. ball for you to practice with and see if your able to adjust honestly the difference in fill in a well fitting ball isn't much between a 12 vs. 14 at least as long as you don't have any injury's preventing it and try it out. it's okay not to be that serious and continue what your doing to the biggest thing is to have fun out there.
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