When running global knock negative numbers are good. If you are maxing at -4.00 then Brad is allowing the engine to add 4 degrees of timing as long as it's happy. No issue there.
High LTFTs are also normal with E30 due to the added fuel consumption required to make the same combustion energy. As long as STFTs cancel it back to 1.00 +/- 4% (IE. LTFTs are 0.18, but STFTs are 0.86, you are cancelling to 1.02), you're fine. If it stay above 1.05 though, you may have a boost leak.