Its tough to tell from the photo because its taken from the from, but you mention its bowing out forward...
The radius arm bushing seems to be compressed more at the bottom than the top, and if the coil is bowing forward then your radius arms arent dropped enough. Can you measure the distance from the original bolt-hole to a the new bolthole? ie: as follows:
except, to the upper-forward bolt hole thats outta sight.
if youre running 5.5" lift springs, those ought to be pretty close to 5.5" apart, otherwise you are forcing your radius arms to be angled down under static pressure, ie, when not flexing. that will bring your beams to an angle, leading your coils to bow forward.