Fueling & Injection - Why 80%+ DC on stock LS1?

Stock LS1 with headers/LS6 intake/ P&P TB/UD Pulley and a tune just to drive it.

at WOT I am seeing 80%+ DC, sometimes as high as 90% and this is with the 97 Vette injectors (28.5ers).

walbro 255 intank that might be dying, would that show up in the DC?

I would check your fuel pressure as soon as possible.

sound perfectly normal

Check your fuel pressure just to make sure. I was dropping a ton of pressure at WOT, and that in turn drove my duty cycle through the roof.