I would take D.Vizard's advice, tester of 19,000+ cams. If you want a smoother idle, you do NOT widen LSA. You reduce duration & keep the same 106 LSA.
Not sure if he said that or not, but I believe it to be untrue based on personal results .
Hot Rod magazine doesn’t agree either.. this quote explains it pretty well
“Tight LSA cams make excellent low-end torque and have a beautiful power curve. But nothing comes without a cost, and idle vacuum suffers as LSA shrinks. This causes the engine's street manners and tuning to become fickle. A cam with a tighter LSA will require a looser torque converter, may not be able to run vacuum-assisted brakes, and doesn't play nice with fuel injection”