.....not to take a different direction but:
i have done ALOT of diamond jigging for bass, tuna, and most anyother species i have run across. That said, im curious why you are adament about spinning gear?
Although i love the versatility of being able to cast or jig when it comes to an exclusivly jigging setup i prefer conventional gear ten times over. Let me note that this is also due in part to my preference for the hammered jigs and crippled herrings of yesteryear
....Now although peter is understandably not a fan of the butterfly jigs let me say that sadly, the few occasions i have fished along side a true butterfly jig fisherman i have not been spanked but none the less taken for a ride around town. Performed correctly there is deffinetly something too the verticle walk the dog action...think of it like a pencil
popper vs a spook....sometime it doesnt make a difference, but when fish are finicky...the spook tends to get it done but requires a bit more skill.
That said while i have found no major difference in the nature of the reals they advertise the correct rods make a huge difference. the short stroke and parabolic action are actualy a big part of maintaining the action...if you to fish a butterfly jig on a normal rod it comes in strait as a needle fish.
All in all conventional or spin jigging is a great way to fish and has put some great fish in the boat for me that otherwise would never have been caught