Carb tunning/mod question

I have rebuild many a carbs but never changed or modified! Holley 750 DP. works grate but had to turn the curb idle screw up to the point that the air mixture screws don't do much for me. Has a 4.5 PV, will probably end up putting in 2.5 PV before i'm done. Idle vac is at 5" at 1100 rpm.(Remember, i live at 6600 foot elevation) Here's the question. Do i drill a small hole in the primary butterfly's? or, maybe all 4 butterfly's?Or, do i drill out the idle bleeds a few thou at a time?

I just realized, i should have started this Thread in Fuel and Air Systems . Mod's could you move this thread over there for me. Thanks.