A little info, I drive a sbc 4link dragster. It runs 5.40 +or- .02 most all year.Last fall at the last 4 of 5 events I attended either 3rd or 4th round I went.480 red on .510 previous light or setup. I added about 10lbs to the weight box in front of car. I can add more weight but I can't get my head around why if it's lifting wheels out of beams it doesn't happen til 6th or seventh pass of the day. Any suggestions appreciated.

D/A shocks/dampers > loosen the rebound adjuster, tighten compression and go down on tire pressure. It'll hold the nose down. Don't be bashful with the adjusters if you have quite a few clicks available, depending on brand.

Did the 60' repeat within a couple of thousandths when it went red?

I don't think 60s or et were off. I'll search slips and computer to see.

If the 60' is the same it didn't pick the tires up any more then it did on the previous pass.
Lately I went from .510 to .497 on the next pass and the 60' went up .013.