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What did you block off on the valve cover? There’s no “emissions stuff” there, only the breather, which you need to have to relieve pressure in the crankcase. Without it, the engine will pump oil out of every crevice, especially if it’s overfilled, and into the airbox, where it will leak out the drain hose and the joints. Also, performance will be compromised because the pistons will have to push against the air trapped in the crankcase. Run the engine with the oil fill cover off and see how much air blows out of there. Shouldn’t be much.
I don’t know why your compression readings are so low, but I would at least make sure your breather system is operating.
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