proform race carb / Idle trouble

You should have squared the primaries and idled off the secondaries. That is why the have 4 mixture screws and two idle set screws on pro-forms. You need to idle off the secondaries and only use the square portion on the primary transfer port.
You can get them to work by changing PV and air bleeds but this should be for fine tuning only. You should never have to go smaller on the bleeds from what they came with unless you have a vacuum leak somewhere. Or bad valves or wide seats.