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I don't know why I didn't see this earlier but I think this question has been asked a few times on here.
As you found out, the only reprogramming a ZL1 can get is the drag calibration for the eLSD. The ZL1 nor ZL1 1LE gets a autocross calibration. The tune you're probably hearing about is the one for the SS 1LE. It's a more refined calibration that the SS 1LE already has.
I read a thread about someone who did a comparison on an SS with and without the calibration. It was noticeable but times were the same and it's something that most drivers won't notice.
There was another user that swore that a GM engineer told him, personally, that the ZL1 can get an autocross tune. Never heard anymore from him about this.
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