Is it ever that easy?
The springs probably didn't do much to your angle -- though it's not possible to say. Usually, they don't unless the axle mounting point is relocated.
The shackles generally give you about an inch of lift, and 2 degrees of error in your pinion angle. They force the nose UP some.
Putting in 2 degree correction shims with the thick part towards the FRONT of the truck, will correct for that.
However, other things could be going on. Measuring it is the only sure way to know.
I'm running without correction now because the cheap-@ss shims I bought cracked all to blazes.