MSD / GM HEI Style Distributor

In my new 500 stroker build I installed a aftermarket distributor for the first time in any of my motors. Came with 3 sets of springs, I installed the lightest set. Also came with some stop bushings. Car starts up very nicely, just hit the button and fires right up, timing set to 36 degrees all in, that was at about 3,000. But, when idling small rev's up around 2,000 / 2,500 it seems rough & choppy to me. Get up past that and it's smooth as a whistle. What have others done with these style distributors? Should I have bushing / different bushing in there? Headed to test n tune tomorrow night for first time out with the car, wondering if I should make any changes before I load up and head out.

The roughest in the motor at 1800 to 2800 RPM in neutral may be in the carb going from the idle circuit only onto the transition circuits
Put a dial back timing light on it and watch what the timing is doing, if it is all in before 2000 RPM it has to be some other part, carb maybe, causing that issue
Personally I wouldn't worry much about it

What is your initial at idle timing? Sounds a little fat off idle.

18 or 19 at idle, comes in all the way around 2,600. Ran the car tonight, pass on the motor was fine, few other things to work thru.