Floaters/Ladder Bars on A body

2 step @ 3500 on a 5500 converter. This is the only way it will work. I started @ 5000,4500, 3800.
On a fresh prepped track, and warm, it's pretty consistant. The 60's though can vary at any given moment by 600 ,and maybe 2 hun more at the 330 and another 2 at the 1000 which come out in the E.T.by a 10th give or take a hun. Real hard to dial the car with a 10th variance in E.T.