Need help with lean stumble on Holley DP

My 71 Dart has a 5.9 magnum with air gap intake and Holley 750 double pumper. Has always run great but I've been fine tuning lately with an air/fuel gauge. Been really nailing down my tune trying to get 14.7ish at cruise and still keep 12.5ish at WOT.

Friday night I drilled out my power valve restrictor channels from 0.59 to 0.625. Had tApe around my drill bit to make sure I didn't drill too deep. Put it back together and it didnt seem to idle correctly like it did before. Good knews is that I now have the cruise AFRs I'm looking for and WOT AFRs I need. Bad new is the idle doesn't seem quite right and it now has a lean stumble at very light throttle. Will go into the 18s for a second until you give it more gas then it's normal.

Maybe has nothing to do with drilling out PVCRs and just picked up trash in the idle circuit? On light acceleration the carb is still using the idle circuit right? Maybe trash in the needle and seat? I'm learning a lot about tuning carbs but I just wanted to throw this out there to get you guys thoughts. If I can get this lean stumble figured out this carb will be dialed in! Let me know your thoughts. Thanks in advance.