Best quad-box setup

I am trying to find what is the best setup for quad boxing as far as performance/syncing. I've been quad boxing Wizards for a while but they seem to lag a bit behind each other and have sync issues more than I see from quad-boxing streamers. Also I have noticed one will lag behind even further and randomly warp back to the group. Just want to gather from people what their settings are compared to mine and where I may be able to improve.

Diablo setup:
Windowed Fullscreen
1920x1080
Low Texture, No shadow, low physic, no clutter
Low-FX checked
AA unchecked
Vertical sync unchecked
Max foreground 30FPS
Max background 30FPS

ISBoxer:
4 windows stacked
dxnothing with FX-Video on secondary monitor
all 5 programs (diablo x4 and dxnothing x1) set to 30FPS limited on foreground and background

Hardware:

I7 3770k
16GB memory
GTX 480
Samsung 840SSD Pro
120HZ Samsung monitor, 60HZ Dell IPS secondary

Thanks,
Draken

I noticed when i changed the CPU strategy that it didn't actually change it under my character sets (might be a bug that lax should look into). Try manually setting 1 or 2 cores for each box. I have a AMD phenom x6 1045T and the way i have it set up now is

main window: cores 1-6
2nd window:cores 1,2
3rd window:cores 3,4
4th window:cores 5,6

Before i made this change my toons kept falling behind and getting out of sync. I had it set so it was using all CPUs with all Windows. I think what was happening was that they were all fighting with each other and that caused stuttering and lag. I'm able to run the game MUCH MUCH smoother now. I hope this helps!