Hi,
When steel heats up, it expands. So, I would suggest performing a wet compression. When this is done, you add about a table spoon of motor oil into the cylinder being tested to see if compression increases. If it does, the rings are bad. If it doesn't, then it is most likely a valve issue or head gasket issue.
Additionally, if you have a fuel injector leaking, the fuel can wash oil away from the cylinder walls causing lower compression.
At this point, I suggest performing a wet compression test to see if the low cylinder compression increases. Do this when it is cold.
Do this and let me know what you find.
Joe
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Wednesday, November 20th, 2019 AT 9:08 PM