Balls require maintenance. My soft covers, sponges as some call them, do soak up oil. You can see them getting shiney. When that happens, about 45-60 games, I have them resurfaced. Had my Scorchin Inferno resurfaced 5 times. It comes back, but not as long lasting.
And, it still hits the 4-5 without going between them.
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Storm - Shift 16# Medium Length
Legends - Conqueror 16# Heavy arc
Brunswick - Scorchin Inferno 16#, Med-Heavy oil
Legends - Terminator 16# Heavy length
Legends - BigRBang 16# Medium Arc