It unlocks after the fact when it realizes what it just did, so 1>2>3>LOCK>4>UNLOCK>LOCK. I think I just need to have 3rd lock later or 4th upshift sooner so it doesn't get confused.
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well I tried the spreadsheet values I made following this and it made the trans very busy.. Probably due to the 3.42 gears and the 4L80E's steep gearing with the 78mm turbo on the 5.3 (Read: Lag) that I have to really get into the throttle to get her going and the trans constantly shifts and TCC locks/unlocks, etc. Copied the 4L60E tune shift points that I remember to be a nice mix of performance like feel and drive-ability on this trans. Will still keep playing around.
Move the sloped part of the shift curves to a higher TPS%.