4 Things affect the height.
1: Physical limitations to height
2: Tire size
3: Adjustment of the location of the three point lift rods, there looks to be 3 positions.
4: Feedback linkage adjustments.
What is the height that they are dropping to now?
Does it have stock tires front and rear?
And what sizes are they?
What position are the Lift rods in now?
The closer they are the lower the arms will go.
Do you have the WSM (aka Service manual) on how to properly set the feedback linkage?