If you're throwing thumbless I'd just get a Urethane ball for a burnt up shot. Storm Natural, Motiv Tank, Hammer Blue Ball... All good solid controllable pieces.
Even with my speed dominant low revs I can use a polyester ball (like my white dot, or a maxim...) when the shot is burnt to hell, but I'd recommend urethane because it's more versatile and will last you longer.
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