holley 600 vac. secondary metering conversion

It was REALLY fat. After looking at the chart, I was supposed to put #69 in block. I dropped it down to #72 and got waaayyyy better. I put a lighter spring in and it got worse again. Bumped it back to a stiffer spring and felt better. I will go and drop jet sizes down to a 70 and see how it does. Just kinda strange that my secondary jets are almost the same as primary #68.
Thanks!