4bbl running rich.

Thanks guys. I mistyped.. it is a 750 single pumper vacuum secondaries. Pump is electric holly. I cut pressure to about 5. Could drop to 4 and I have light springs in it now. I was thinking I might actually need heavier springs since it puffs slightly blue for a split second when I goose it. Also thought maybe 'economizer might be rich so I cut it back one slot. Any thing else come to mind?