I think most ecomodders would not slip the TCC. It is good to know about though. I don't use mine while hard downshifting for that reason.
There is a simple way to increase the engagement pressure in a Toyota, at least, that has the kick down throttle linkage. You simply tighten the cable by moving the lock nuts. This also reduces wear on the bands.
Explained better here:
The Free Mod Series - Part I Quicker Transmission Shifting
Also there is lots of info for Toyota transmission modding here:
The Free Mod Series: Part VIII Manual Electronic Transmission Controller
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