In hindsight, that is probably the understatement of the year. I was thinking all the mechanical improvement, regulation, better pressure, tight tolerances, stronger/straighter friction surfaces would help the computer to compensate less.
Because the computer guesses (I mean characterizes, haha) the actual pressures it could be doing things to create more hysteresis (fluctuation) instead of smoothing.
With the stock settings, the original red flag was a strong noisy shudder going up a steady incline in 5th at about 50mph and maybe a slight acceleration. It was the kind of drivetrain noise that makes you think u-joint failure because of the slight but rapid velocity changes in the driveshaft, resonating quite noticeably. I didn't actually log this condition, but it did present in a lesser form after some initial tuning, and it was quite evident that the measured TCC slip was yoyo-ing up and down rapidly. If I give the benefit of the doubt to the converter builder, such that the friction is good (lets say it mated nicely and has a good grip above a stock JBMX, and the TCC engagement quickly reduces slip such that the computer counters by reversing the pressure quickly causing a nasty slip/catch cycle which is shudder.
My current tune is to increase the TCC pressure (well below what others are using), bump the apply ramp on the plus side to 1.5x stock plus 10kPa, and to roll the 5/6 slip from 20 at low rpm to 10 at 2000 with a gradient in between, and reduce the adaptive to +/-5 psi. With that the slip logs close to zero under most conditions, so I think I am in an overshoot condition, where I have plenty of pressure to lockup at what the computer characterizes (guesses) at about 42-46 psi.
