Transmission slipping after stock tune installed

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I recently purchased T2 EX for my 2019 chevy Silverado LTZ 5.3L. Everything installed as advertised with no issues. I did the unlocks by the book and had 0 issues. I was exited to run a tune to see the difference and installed the 87 octane tune with modification to TCM speed limiter and throttle boost to 25%. After using the 87 octane tune for less than a day to try it, I defaulted the tune back to stock and noticed my transmission slipping now under heavy acceleration on shifts 2-3 and sometime 3-4. I have 105k but I have never seen this before even under heavy acceleration or towing before installing the T2. Is there anything that I can do? Feels like pressures might have dropped and its not holding like it did before. I tried twice to go from a tune to stock and still having the same issue, please help. Im afraid if I continue without correcting it, I could damage my transmission permanently.

[mikel]

that really odd, the stock tune is exactly how it was prior to the tune being loaded. Can you try disconnecting the battery while stock and reconnecting to see if it relearns or helps?