I doubt if the Firehawks were Holoflex.
I've sanded and polished an dsanded and polished by Firehawk and it's reaction has been very consistent, unlike my Heat 2 pearl.
I have to believe that the holoflex additive was just, as someone here implied, in the very top most layer of the coverstock and it was easily sanded away with the first decent sanding.
As a result of this, I would not recommend any ball with Holoflex in it, unless you are willing to throw away the ball after 100 games maximum. I speak from experience in having resurfaced my Heat 2 pearl in at least 5 - 8 different ways with no success. I loved that ball but Track/Columia's method made it, in my opinion, un-restorable.
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"We get old too fast, and too late, smart."