1) Don't use slime
2) Don't use tuffies
3) Don't use "thorn proof" tubes
Stick with the conti gatorskins. Or pick up the GP4000's w/vectran. Spare tubes, patch kit and you're ready to go.
What exactly are the source of these flats? Riding too close to the gutter? Glass? You can't have it both ways, light and puncture resistance. It's either or.