Go with the Rule GP2. If it'll be used for heavy oil, put a strong and early rolling drilling (ie. drill it with a low leverage pin and the mass bias swung out on or passed your VAL). It will hook earlier when your Animal isn't quite grabbing the lane early enough. If you need a ball for heavy oil, particle balls (ie. the Rule GP2) get the job done.
Another option is to scuff the Animal with a good burgundy or green scoth-brite pad and use it as a heavy oil ball. You can then put the Arsenal Reactive under it (for med/heavy-med).
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Dino
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