Tuning my 360 with a wideband.

My details:
360 Magnum crate 390 hp
R/T heads
230°/234° @ .050" 0.501"/0.513" Lift 107* lsa
4spd
3.91 gears
Holley 80508s vacuum secondaries
MSD Ignition 25 initial 34 total one light blue spring and one light silver spring
50cc Accerlerator pump, currently playing with squirters to get rid of a slight off idle lean condition when punched
Also, should add, 12" of vacuum at idle and currently a 6.5 PV in in it.

My question:
When I'm cruising on the interstate, around 3k RPM I can't seem to get my a/f raio higher then mid to high 13's but when I
cruise around 2-2.5k rpm its ussually right around mid 14s. Because it went fatter towards the higher rpms I tried to lower my
mains, i've gone from a 71 to a 70 and now down to a 69 with only slight improvement. I don't want to go any lower, because I think i'm
loosing power during acceleration.
I'm not sure what to try next, I was going to try to restrict the IFR's and put the 71's back in but thought i'd try here for some advice also, I know you were able to give loosenutz some great help.
thanks!