Do I need lowering blocks? Dom 2600's bags

[t76turbo]

I just installed essentially the porterbuilt stage 2 rear basic kit, porterbuilt bolt in cnotch, 2600 bags. I am running factory trailing arms.

On the front I still have coils with drop spindles. Should be about 4.5 inches of drop up front I think.

I am still buttoning things up at my buddies house. But I did notice that at around 20psi the rear is a little too high. I was under the impression that this setup would be around 6 inch drop. But at even 20psi it is too high slightly.

With the setup I have now, would you typically have to run blocks to match the front?

What pressure do most run at ride height on the 2600 dominator bags on the rear of a c10 fleet.