That IS where my primary t-slot exposure is... and the secondaries are closed, because otherwise it idles too fast with the 4x .100" holes and the "grab whatever fits" PCV valve I'm running whistling Fortunately I have a 4-speed and the idle is 1200+ anyway, so I don't have to worry about an in-gear drop.

I found an old Speedtalk thread (https://www.speed-talk.com/forum/viewtopic.php?t=2767) where the guy didn't like holes in the blades because that airflow comes past the boosters and tends to start them too early. Wonder if that's part of my problem... anyway he recommended bypass air without holes. Dom absolutely is against any bypass as you can see, above. Some others recommend turning off the secondary idle screws completely and just dealing with the primary idle circuit!

To have even more things to change, as if I wasn't up to my ass in alligators already, I ordered some non-drilled blades and a Fram FV178 smile