Vacuum Tuning

-The PCV will not change the engine vacuum in any meaningful way.
-The base timing will make the biggest difference, followed by idle rpm.
-The PCV just makes it easier to get air into the engine, to get the A/F where the engine wants it, instead of resorting to other ways, such as a too-high curb idle screw setting or secondary cracking.Cracking the idle screw brings fuel with the air, and upsets the transfer port sync.and possibly the spark-port sync as well.Cracking the secondary screw may or may not bring the fuel along depending on design. The PCV does not bring fuel.I use it as a tuning tool.
-Your not understanding camshafting very well. The low vacuum reading, and the pulsing of the needle, is caused by the late closing intake valve, allowing some compression pressure at low rpm to turn around and head back into the intake manifold.AS rpm goes up, there is less and less time for this to happen and eventually the vacuum will stabilize at a high point, after which it will slowly begin to fall again.Try it in PARK and you will easily see it.
-Another thing that can happen at idle,if your primary butterfly is too far open is this;That pressure spike coming back from the cylinder can travel past it and past the idle port.Now that port, and maybe the transfer port too, dump fuel anytime it/they see air go by. It/they dont care if that air is going up or down. Then the next cylinder in the firing order pulls its charge which is now artificially enriched. Very hard to tune for that. Thats why with your cam its so important to close the primaries down as far as practical and still have sync with the transfer port.And thats why we introduce air in the secondaries, or the PCV, or in some other way.Like I said, that cam likes idle air.
-You havent told us yet what rpm youre targeting.I suspect it may be too low.If the engine is fresh it may have to be up nearer to 950,or better, until she breaks in some and loosens up.I know that cam sounds great at 700, but sometimes its just not practical.