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Run a cylinder leakdown test on the engine. My bet is that you will have one that is very high. If so, since the rings are new, either there is a wear issue in a cylinder, or you have a cylinder that is out of round.
A leakdown test is where you have a gauge hooked to the cylinder and then apply controlled air to see if the cylinder can hold pressure.
Are you premixing the fuel?
I do not feel that changing oil brands will change anything. Your compression tester has a valve on the end of it, thats why it holds compression.
Just because you have compression, does not mean that a valve or the rings are leaking. When doing a leakdown test, you also listen to where the air is coming out of, different locations mean different items could be bad.
Is that oil on the outside or the inside, that is running down?
This could be the powerhead gasket, the oil pan gasket, or even a cracked oil pan.