Mine on canned level 2 acts the same as you state, empty.
I saw 92 ~ 98 % once when I pulled out on the 2 lane 70 mph speed limit country road and smushed the go pedal to da floor loaded with 2 round bales + 500 lbs of alfalfa cubes on the trailer and 500 lbs of corn in the bed.
IIRC 1st & 2nd were around 80 %, 3rd TC locked was 94 ~ 99%, OD was around 75% max, any more pressure on the go pedal caused a downshift.
I did have my trans shift firmness set higher wot shift points higher and some other things adjusted through the custom options menu.
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07 F150 screw, 5.4, auto, 4x4 esof, lariat.
Gryphon with 87 performance custom tune.
275/65/20 dura tracs, 2" AS - 3" block, true duals with h pipe to flow pro dido, ugly arsed tips pointed in a funky fashion.
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