My best rig for throwing big hairy 3/0 bass bugs is a fiberglass 8wt that bends right right down to the cork for powerful open loops.
This is a situation where a fast action rod casting tight loops is not what you're looking for.
However, big glass rods are heavy and none too pleasant for all day casting.
Over lineing a graphite rod will accomplish the much same thing.
You don't want a long rod either. Shorter rods are more accurate for close in casting and with bass fishing accuracy is far more important than distance.