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The V6 8 Speed is a different transmission, but the tune is 90-95% the same.

The PENTASTAR can gain 15-20 WHP peak and 25-35 WHP/WTQ midrange on 93 octane. Roughly 0.4-0.6 seconds off the 0-60 MPH...

I can hit full WOT at 1,800-2,400 RPM starting from a dead stop. Try these changes not as aggressive as mine, but will make a difference compared to the 3.6 tune you posted.

Fuel-> Power...

Did you add Spark Retard (Sensor) to your channels?
Have you tried to Repoll the channels while the car is connected?
It's under the Vehicle drop down.

2018+ Vehicle need the HP Tuners Smart Access Cable installed to do any reading/writing.

I showed this video to a shop, they installed my cable in 20 minutes.

https://www.youtube.com/watch?v=oFirSnrp1W8