Slower but more reliable speed control... just like John says.. make an adjustment to put more pressure on the ball, or at least keep the pressure on the ball longer.
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One common way to do this is to alter your rollover grip. Instead of using the weight of your forewarm and wrist/hand on the front or top of the handle, you might wish to switch to a more "power" type rollover grip ... actually virtually pulling the handle back towards you, with the wrist on the bottom front or even complete bottom of the handle. Closest analogy would be a bicycle chain on a sprocket instead of a fanbelt on an engine (those have teeth or very sticky rubber to help the grip in V-belt type configurations).
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You'll prolly realize quickly, why it's more of a "power" rollover grip, and may have to lean backwards or away from the target goal. Your final shot trajectory on both pull and push sides will also change, even drastically, and you have to focus more on your straight-down-the-middle shots as any spraying will be exaggerated ... return strokes to center should actually be easier. So make an adjustment.. Shouldn't be too hard.. Keep in mind that the idea is to 1. have more pressure on the ball, over the whole "pitch" motion, and 2. have more control, for longer on the ball at takeoff.
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You might have to pad that handle thicker or adjust your winding with a wrap, to prevent bruising. Prolly feel weird, but I'm sure you'll see many top proMasters with no "Layover the top" type grips but more like a pulling-away or pulling-upward chain-and-sprocket grip. Prolly not as fast as the "Layover the top" grips, but definitely more control and most prolly more reliability from table-to-table and from different 3bar-to3bar.
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Can't hurt to try, right? And you can prolly regain the perceivable speed of your rollover with more and more repetition, for smoothness, which is usually the key.