You can cut the timing back 3-4 degrees, but it's not gonna help you out much. You need atleast a 3/8" fuel line - and thats out of the tank. To run in the low to mid 12"s, which is where you should be running, your fuel pump should be able to fill a one gallon can in about 30 seconds - minimum - and thats measured from where the fuel line connects to the carb. Forget what the pump MFG. tells you. You need to actually check it to be sure. Your 60 foot times are off about a tenth and 1/2 also, indicating you have a traction problem.