Agreed @DP1011 finding the sweet spot is crucial and that sweet spot changes on several variables.
As someone whom drives a Jeep Gladiator I’m already at a disadvantage for climbs, carrying an extra 250+kg compared to short and long wheel base Wranglers.
Climbing needs to be approached with care, and momentum which can be hard to maintain with the amount of crosstracks in popular climbing spots around Dubai.
i also use “Part-Time” and off-road plus on alL my drives. Anything in the range of iftar bowl I’ll use tiptronic as my jeep has a terrible habit of change up to the next gear just as momentum is sapped. At the same time the Jeep gearboxes computer also has a terrible habit refusing to change down with a shift not allowed message when it does not like the rev range .
one crucial component of a climb is the slope you are climbing, this is hard to judges visually by the nature of large dunes playing with your visual perception.
for the throttle always feather, as it’s not connected by a linkage it’s always better to have scope push a little harder assuming the jeep computer allows it.
Incidentally I drive lower than 11psi -t the start of drives, but I’m running geolander all terrains the Light truck variant, these have stiff sidewalls and extra layers compared to the regular AT.s
my advice next time you are out there at a climbing spot, ask the marshal if you can do a few more practice runs. This immensely helps to build skills and consistency
and then there are some days that no matter what, you just are not gonna get as far up as you want, don’t push it and accept there will always be another future drive.