1000hp is right. I have the same results. The people that are saying there is no issue are not changing the factory defuel values enough to see the tables do nothing.
Make the LMM overfuel a shift. That is the best way to show the table is controlling the truck. It is impossible to do with the tables we have now.
You can get good shifts at WOT and good shifts at part throttle. You can't get it to shift perfect like you can on an LLY or LB7 though. That is were these table would help a lot.
Last Sunday I took an LMM out on a 5hr beat run. I had maxed out these shifting tables one by one and seen no difference one way or another. I can get a part throttle defuel at 70mm3 down to 58mm3 no matter where I set the tables. At one point, all the tables were set to 100mm3. That should have caused the truck to fuel from 70mm3 commanded to 100mm3 on the shift. It did not do it.