Question for Piper cam owners

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My race zs has piper 270 cams in and very light flywheel. It's always stalled when idling and runs rich low down. Top end is fine and not lean as its running a remapped ecu. Question is what's other people's running like? Thinking It will have to get a piggyback ecu to make it run better low down and so it idles better but not sure on which way to go as the Siemens unit is a pain. Help appreciated