Engine leak - Part II

[67Fleet]

Well, seems my oil leak is getting worse. I still haven't been able to isolate exactly where it is coming from, but it is somewhere on the back of the motor on the driver side between the valve cover and just above the oil filter housing. (that's why so hard to find the exact spot, it's so darn hard to get my eyes back there to see anything!). Last night I drove the truck to Old Town for the cruise and got back and there was oil all over my exhaust pipe and this morning when I checked underneath, there was a small pool the size of a shop towel on my garage floor.
Today I looked at everything I could, cleaned up a lot of crud underneath while I had it jacked up, changed the oil/filter, and did a compression test on all the cylinders to see what I was dealing with.

The good: No antifreeze in my oil, it didn't appear to be contaminated at all.
The bad: The leak seems to be getting progressively worse and I don't know the root of the problem. May have to pull the motor or have a leakdown test done.

Here's the cylinder compression test results (without firing orders, I'll try and map it out how I did it)
back of motor
pass side driver side
182psi 183psi
188psi 180psi
190psi 169psi
190psi 187psi
front of motor


The one cylinder 2nd back from front on driver side is a concern since it was so different. Any ideas from all this info on what my leak problem could be? Since there is only 1 cylinder drastically different, and no antifreeze in my oil I think I can rule a blown head gasket out. Something's probably cracked and I'm screwed. That's my luck.