Tuning my 360 with a wideband.

I'll say this, I think I'm learning just how much weather has and influence on the a/f mixture, specifically humidity. Its been like 80+% relative humidity in the mornings here, and like 30% in the afternoons, I dropped my idle mixture down a bit and that seemed to help the lower rpm cruise #s come down. So in the AM i'm around 13.5-14 all around, getting a bit richer towards 3500rpm. And right around 14.5 in the afternoon when the air is dryer.
Now, choosing a PV..? I have a 6.5 in there, and vacuum at curise is easily around 15", when I start to open it, the a/f mixture stays at ~14 till the pv starts to open up, should I try the 9.5 PV I have to try to get the mixture richer, sooner, when accelerating?