I have not been using a case spreader.
Here is the pattern I started with.
Driver: 0.129
Pass: 0.125
Pinion: factory 0.056


I initially added 0.010 to the pinion and got this:

The another 0.010"

Then I started from original again and started making the pinion shallower.
Pinion :0.052"

And again to 0.047"

And finally 0.042"

Of all those, the I settled on the 0.052" depth as the "most acceptable" based on several sheets like this:

Ideal? No. Acceptable according to the manufacturer? Yes. Backlash is in spec. I would have expected it to at least change the sound being made if it was something diff related.
Here is the pattern I started with.
Driver: 0.129
Pass: 0.125
Pinion: factory 0.056
I initially added 0.010 to the pinion and got this:
The another 0.010"
Then I started from original again and started making the pinion shallower.
Pinion :0.052"
And again to 0.047"
And finally 0.042"
Of all those, the I settled on the 0.052" depth as the "most acceptable" based on several sheets like this:
Ideal? No. Acceptable according to the manufacturer? Yes. Backlash is in spec. I would have expected it to at least change the sound being made if it was something diff related.