the not upshifting till higher speed symptom sounds like the kickdown adjustment on the valve body (throttle valve.)
The long screw with the jam nut that holds the throttle valve in needs to be adjusted for more clearance between the kickdown lever and the throttle valve. Look in the Monroe book, he describes the tool and the distance it should be.
Slow shifting into third can be leakage in the seals, front servo, or excessive front clutch clearance. If you installed the restrictor from the TF-2 kit into the case, remove it and see if it helps the 3rd gear shift.