Pretty much same here.I had more than 100 tweaked calibrations by the time I was really happy with my 4L60E.
4L60E & gottdamnt 2.56 … most of the time & mental energy on all the 2Up3 & 3Dn2 shifts, in the beginning.
Once all the 2Up3s & 3Dn2s finally got worked out just right for sure, started allowing 4th gear use again.
4L60E & 3.42 was 10x more satisfying to tune, and 50x more satisfying once finally calibrated.
What other gear spreads are available for a re-geared 4L60E?