Engine Dieseling - Options?

no vac advance hooked up yet although FBO strongly believes in manifold vacuum advance to 30 degrees - info somewhere on here indicated the idle Im at, really haven't tried to slow it down to much - Im all for rechecking, rechecking, and rechecking, I can easily close off mixture screws and shrink the T slot exposure more, even if a hammer is needed, I didn't hesitate to smack those Doug headers LOL