Whackers tend to be pretty dead on the A and especially the E. I'd recomend trying mixing Innovation Silver Slaps with the Whacker D and G.
Also, you should check out
www.doublebasschat.com. We're mostly a bunch of rockabilly guys and gals over there, and a lot of them will have more experience with the whackers than I have (only played them once), and can give you some better advice.
Welcome, by the way. You've joined the dark side of bass. There's no going back now.
