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I don't think there is a different approach, but a few things jumped out at me looking at your logs:
(1) Your knock starts at 4400 RPM and it looks like your timing dropped concurrently 2 * -- look at your timing maps and fix that spot
(2) AFRS look a tad rich in the 4000 - 4400 range
(3) You are seeing 15* at 7200 rpm (which is similar to me from memory) but you are knocking throughout....You may want to remove 1 degree from 4000 - 6000 and see how that works for you...I have found that just 1* can make a big difference (oddly)...
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3" Modified Megan Racing TBE & UR Cat.
Buschur O2 & Buschur Exhaust Manifold
Nisei LICP
DC2 oil catch can
Walbro Fuel Pump
Injen intake and UICP (w/ Perrin Filter)
ETS 3.5" FMIC
Zeitronix ZT2, ZAVT1, and Boost solenoid Failsafe
SMC Kit (50% Meth / 50% h2o )
GM 3 port BCS (28psi tapering to 22psi)
Enkei 17 x 9.5 NT03M 275/40 Azenis
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