"I picked up a second OE style twist cap and plumbed both to the back of the carb through 2 PCVs. The idea is to try and introduce less than atmospheric pressure into the crankcase for better oil control. I don't know if it works but it can't hurt."
that is not a good idea. your creating a massive negative pressure inside the engine block, oil consumption and other bad things can occur, more is not better.
the idea is you want to create a slight negative pressure inside the block thus you have a breather on one side and a PCV on the other creating a controlled vacuum leak, that only creates negative pressure when vaccum is very high, idle, cruise, and off when vacuum is low, acceleration, load on engine.
the breather can be either part of the air base cleaner or a breather cap. breather caps suck because they can blow oil on the valve covers.
the air cleaner breather is better because the hose rises up to the base and any heavy oils never make it up to the filter just the very light oil soaks the filter in the base, the base filter eventually gets gums up from the dirt going through the main air filter and the oil in the breather gets gummed with dirt so you want to replace the breather filter in the air cleaner base when you clean the main air filter.
the cap breathers just spray crap all over when you accelerate and vacuum drops
but you need to have open atmosphere on one side and a controlled vacuum leak on the other which causes a slight negative pressure in the block because of all the internal restrictions inside the engine.
2 pcvs on both sides is making negative pressure all the time with no release, you could suck in a gasket or oil or blow out the fuel pump diaphragm, there is no equalization inside the block when you let off throttle or acclerate just constant negative pressure that is looking for a way to get to normal atmosphere somehow.
