How to properly drill carb jets?

MopaR&D said
I got the kit for the 625 because I'm at high altitude and it needed to be leaned out from factory. Now I'm running #87 primary jets and 62-54 metering rods, I had to richen up the secondaries "back" to the factory #86 jets and now it's pretty much spot-on. I could possibly even go one step leaner on the primary side, I have 64-56 rods for that.
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Ahh, well that explains that! I got to a point where I needed to consider drilling bleeds etc for overly rich off idle cruise and either plugging or restricting the secondary bleeds to eliminate a hesitation when going wot quickly. Not really the carb for that sort of tuning. Still a nice carb though.