I'd go urethane as well. King of the Short Oil era when there was exactly what you described: light, short oil with dry backends. There are plenty of other urethanes out there besides the Groove Urethane that actually have dynamic cores if you're not totally set on Brunswick (I know this is the Big B forum, though). The Slate Blue Gargoyle, XXL (discontinued?), (Super?) Trooper.
SH