im at 26 degrees with soa and 4'' springs plus shackle lift. That is close to the max angle it can be. with just soa you should be around 22ish. probably need to drop the tc case down 1/5 inch or may be even 3/4 of inch. you can also move your rear end back 1 inch with the 3 hole spring perches to help achieve an even better angle. I have my rear end set 1 degree less than the driveshaft angle. you can go up to 2 or even 3 degrees less than but that is tops. This is for axle wrap.if you have a torque arm or traction bar i would leave it a 1 degree less than drive shaft angle.
Also there are tons and tons of these threads on here on this topic you can read up on.
hopes this helps
"Life is hard, it's harder if your're stupid"...The Duke