Paul, yes I have bowled on practice with heavier oil patterns. In fact, I did this intentionally all Summer. A house near me lays out the PBA patterns for practice 1 night a week, and I took advantage of it. Bowled 6 games per week on them, and learned a lot. It was much different bowling without the pressures of league. I took my time. Studied the ball reaction. And, tried my best to learn to read the lanes. I actually think this helped.
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Legends - Dynamic Power 16# Med/Heavy arc
Legends - Terminator 16# Heavy length
Legends - BigRBang 16# Medium Length
Legends - Black Diamond 16# Heavy Length, ready to step in.
Legends-L/M Xtreme Damage in my future