well you are losing at least 4 tenths at the 60 foot mark. You should be around the 1.65 60 foot. Now on to the rpm problem...I'd think if you had a fuel problem it would be ok thru 1st and maybe 2nd. From my experience when you have a poo poo pump it's at 3/4 track when you find out. Are you running it w/ an air cleaner assembly? If so remove it and run just the base plate. I'd think with that MPh you should be real low into the 12's and if you can pick up 2-3 mph maybe high 11's.