Agree with your thoughts on the
oil pan.
I'd be concerned about the lower compression pressures on Bank 2.
If in doubt, I'd repeat the test, fully charged battery, carb wide open, no fuel etc.
Your lowest of 173 is less than 90% of your peak of 195, more than 10% difference.
I would be EXTREMELY interested in the pressures of 2 & 6.
I'd bet they follow the same pattern.
Having said that, it appears Bank 1 is healthy, Bank 2 has compression loss across the whole bank, which could be a headgasket issue, which could also be your crankcase pressure issue.
A leakdown test is now mandatory.
Ultimately and unfortunately, I'd say the engine has to come out.