[3.4 grape of wrath]

I'm looking for some thoughts/suggestions on increasing the stall from 3200 to 4000. It's an edge torque converter. Would the stall increase be too loose for street use? What kind of et improvements could I see if any? I'm still running a stock z28 10 bolt rear with nitto's so I know I can't launch it at 4000 but would it help my time at all? Currently launching at 2500 rpm's to prevent tire spin. Engine is a 3.5 liter 60 degree v6 running 15 lbs boost with a performabuilt level 1 a4 tranny with trans cooler.