A_P_K,
I got a Brunswick Blue Sanded Attack Zone, (solid urethane), 15 lb Used, that I haven't used for a long while, if you'd like ot try it. It isn't sanded much any more of course. It's a plain 3 piece core, but it hit very nicely many times. Last used it the previous Summer, 2002. If it works, then you can always buy a new expensive urethane, if it suits your purposes. Also have a 15 lb Blue pearl Hammer, used, that I can't use any more. You'd only have to redrill the thumb for your span and pitch.
Message me if you interetsed.
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"Those who do not remember history are doomed to repeat it."