Holley 600 dp jet help

It is all tuned out with a vacuum gauge so I am in optimum range for mixture. So when adjusting the secondaries are you referring to the spring and screw on the accelerator arm or cams? It has the stock 6.5 power valve. I need to put the gauge on it again but I think I had around 20" when it was all tuned out you think I could benifit from a 9.5 pv? I think the primaries are ok at 66 there is no hesitation at all.