I have a 3200 YANK and I can't load it up at the tree to 2800 it too wants to pull through!
So I keep mine down around 2200-2500 the when the light smashes the last yellow it's to the floor and up it goes - getting a low 1.6 60' - Will be better next time out (New tune at 701 RWHP and 582 RWTQ)
You also might want to bleed the brakes, it may not solve the problem but you will at least eliminate any old juice in there and will be sure there is "NO" voids too!
Go to a synthetic or the DOT4 fluid, see if that helps! NAPA brakes may not be the best for dragging so you might try HAWK pads or GM's Z06 Pad (if you haven't already)
Are you by any chance using ceramic pads? If so don't!