Andrew,
I can see the 4 dull balls being similar, but the Ignitor also reacts the same for him??? Generally the smaller the hook a person throws, whether because of low revs or ball speed, the less differences one will see with various balls AND drillings.
The Ignitor, the new Sheer Havoc (esp with its smooth shell) and anyone of the other 4 should be a virtual 3 ball arsenal for him.
However, I am VERY surprised that with the 2x2 drilling of a Brimstone that he gets any length at all, except of the very heaviest of oil patterns.
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"We get old too fast, and too late, smart."