Smash Zone or Swarm should be two good choices for you.
Swarm would be more angular overall than the Smash zone
Both have great coverstocks that last, Powerkoil18 Pearl(Swarm) and EnMotion Pearl(Smash Zone, same as Twisted Fury).
You'll be able to fine tune the reaction more with the Smash Zone, because of it having an assymmetric core.
You should be fine and be able to fill that gap with either ball, even with your speed now, which is at a good level, most PBA pros have an average ball speed of 17-18
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Twisted Fury
Raw Hammer Pain
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