Most of the ball speed indicators are measuring the ball speed at the pins. Now your ball will lose about 3 mph going down the lane. So a 11.5 mph at the pins is approx. 14-15 mph at release. the average speed at release for around 180 bowler is 17.8 mph.
So at that rate your only just a little under the average. But if your happy with ball reaction and carry, don't worry about speed. I would say try speeding it up some in practice, see how it looks, improved carry etc. If it looks good give it a try.
Now you can easily increase your speed 1-2 mph just by holding the ball a little higher in your stance. Also lane conditions and the ball path down the lane can affect your ball speed.
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