Suspension and lift questions

[Desert Rat]

I went with 6" TC EZ-ride springs up front, an ORD 4" shackle reversal in the rear, 4" TC EZ-ride springs in the rear, and left the front sway bar off. I have one Bilstein 5150 shock on each corner and the truck rides very nice. I also did crossover steering though while I was at it. At first I also did a zero rate in the back for a total of 9" of lift in the back. This is due to the D60 up front adding about a half an inch or more to the front over the D44 and the usual sag in the rear. Once I was done, it sat a tad high empty but with a load was about even. Then I pulled the zero rate and fabbed my own zero rate from an old spring to drop it a tad. Now I wish I had left the 1" zero rate in as it sags under load.

 

[Laguna37]

Now a shackle flip question. The lift I ordered comes with 2" AAL for the rear and a 4" block, I will be replacing that block with a DIY4x shackle flip.

Should I just buy the brackets, or should I include a set of their 4.5" or 6" shackles?

I want the truck to have a little bit of a raked stance, but not much..1" or 2" higher in the rear. To compensate for the truck squatting under weight/load should and to achieve this rake, should I get the 4.5" or 6" shackles?