df2x4 check this thread out. These guys are all saying a harder quick shift is better for towing. I’m really hoping to get a call from Black Bear Performance to hear his opinion on this.
https://grassrootsmotorsports.com/forum/grm/towing-with-a-4l60e-best-practices/61435/page1/
^ X2 on what Schurkey said.
And like I said earlier, personally I wouldn't alter anything in the tune involving a 4L60E. As far as I'm concerned they're basically made of glass, and they need every bit of cushioning and torque management that the factory provided.