What cups or plates to use? 20"s, accuair and stock components.

[Pkh66]

Here is what I'm trying to achieve. I want to lay level at all settings meaning utilizing the same or similar amount of the bags to front and rear. I am planning on running a CPP HD notch as I am not trying to disturb the bed. I am wanting to keep the original suspension components, TA's and CA's. Do I need to cup below the LCA?

Here is the gear,
Jason hooked it up on the accuair air mgmt 2 system.
20x8.5" and 20x13"s
Contitech 2600's all the way
Tires are 255/45r20's and 15x29x20's. They both should run around 29"s mounted.

How low will it go? Level.
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