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There should be a breather opposite the PCV - regardless of the side it's on. But - what you're hearing is not crankcase pressure as one might think (bad stuff). It's escaping pressure from a cylinder that was sealed when you shut it down. No big deal.

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The hissing stops as soon as I crack the filler cap. I definitely need a breather there.

So is the pressure just slipping passed the rings of whatever piston moves up on the compression stroke after the engine is shut down?

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What your hearing is the motor sucking air into the crankcase, not pressure escaping Try starting the motor up with the oil filler cap off and put your hand(palm) over the hole in the valve cover to see if it has pressure trying to push your hand off or if it ends up making a vacume after running for several minutes The PCV will take several minutes to suck all the air out of the crankcase before it will start making a vacume inside it If it has pressure from blowby it will make pressure as soon as you start it up All motors that use a PCV need a inlet vent, it is best on a V6 or V8 to put it on the other side of the motor away from the PCV as far as possible