A-904 shift kit

sounds a lot like my combo. what did you do to the spring?, other option... full manual valve body

Sorry if I'm jumping in and interrupting, but adding more or heavier spring makes the shifts later in road speed (driveline speed)
Lighter or less spring makes them earlier.
Changing governor springs and weights moves all the shifting father up or down in the wheel speed ranges.
Changing springs in the valve body makes it possible to change the shift point for a single gear (like if the 1-2 shift is too early but the 2-3 is where you want it.)
You would then use a tighter spring for the 1-2 valve and leave the 2-3 alone.

What I did with my TF2 kit was to shoot for the middle range of the oil holes in the separator plate and it gave me nice solid shifts at higher throttle openings without being annoying at lower speed and throttle.
Say for example the instructions said the 1-2 oil hole could be as large as 80 thousands and it was currently 40 I drilled it to 60.
The kit for mine came with the option for an "at any speed low gear downshift" and I did want that.
With the ratchet shifter you REALLY have to mean it if you want the first gear downshift because you have to ratchet back twice in a row on the shifter to do it.
My car is pretty high geared, and I can drop it into first at 40-45 and have all kinds of instant horsepower and torque available with the RPM's
It puts the engine in the mid to high range of my cam instantly.