How much rear lift 1.75 inches to 2.5 inches for Level stance

So I have 1.75 inches lift in the front with 5100s. I want to raise the front to 2.5 inches and still keep the leveled stance. Techincally all I need to raise the rear is 0.75 inches but a one inch block is the minimum available to level it. However I keep seeing that 1.5 inch lift is required for a leveled stance.

 

Usually there is about 1” of rake on these trucks. So normally you’d raise the rear 1” less than the front to achieve a level stance.