Stopping the knock: Lower compression and ported heads...

Agreed on straight up= same as LSA. Anything other is advanced/retarded.
Also agree that tighter quench is the proper route.
My point is this-
All the factors point to it should not have any problem running on 92 octane.
The cam may have been degreed, but nobody seems to be sure if its correct.
Cranking compression is higher that what it should be, indicating something isn't right, and possibly the camshaft is too far advanced.
The cam card clearly says installed at 106° ICL will be 2° advanced, with IVO @24.5 and [email protected] measured @ .050" lobe lift with it set there.

Telling a guy that advancing it up too 8° is a good idea is IMO a problem. Granted, we all want to help the guy but that's just bad advice for the OP.

Along those lines, you need to remember, most cam manufacturers grind 4* INTO the camshaft. So, even if you install and degree it "straight up" it is likely advanced 4* already. SO, if you installed it advanced, you can probably add 4* to wherever you installed it, which would raise cylinder pressure even more

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