Why so much inital timing???

I was making highest idle vacuum/RPM at around 22*. Once I properly set the primary t-port so the idle circuit was actually doing anything and used only the secondary to adjust idle, highest idle vacuum/RPM was now around 19*. I suspect if I give her even more air via drilling holes in the butterflies, I'll be down to 15*-18*. So could be as simple as overly rich from t-port or leaking pv right?