Cognito UCA/ leveling kit

[TTLex]

I have a question for those of you that are familiar/ or have the Cognito UCA's.

I have a Fabtech 6" lift that i want to get a little more out of. I just put 40x15.5x20's on the truck today, and I need to get a little more room, mainly up front. I was going to put a 1 or 1.5" spacer in the rear and get some green keys then crank the front up a bit. Im a little worried about the stock UCA joint being at too much of an angle.

If I add the Cognito UCA's, will this solve my issue on worrying about stressing the joint too far? Also, would I still need the green keys, or can I just crank the stock torsion bars up with the cognitos and call it a day. I might not even get the rear spacers, the truck is sitting at a rake right now that needs corrected. ITs probably 1.5" lower in the front right now that I can probably solve by cranking the stock bars.