Kasey, what carb do you have? I have a Quick Fuel Q-750 that I had to drill the primaries to clean up the idle. I tried larger idle air bleeds, adjusting the idle screw on the secondaries and timing, but the thing that helped the most was drilling holes in the primaries. I'd only do this as a last resort.

BTW, in my experience if the secondary idle is opened to far the engine will surge at cruise speed.

You should be able to kill it with one air mixture screw.