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Here is the timing map that I use on a lot of Evo 9s. Of course, every Evo is different and you will have to tweak this map to fit your need. Keep in mind that this map is set-up with 21-22 psi peak boost (3500-3700 rpm) and the boost holding @ 20.5 psi in the midrange and then tapering to 19 psi by redline. The AFR for this timing is 12-13 during spool-up, 11.6-11.7 during peak and gradually tapering to 11 by redline. It goes without saying, that if you run less boost, and a richer AFR then you can run more timing.
Unfortunately if your car is knocking up top then your only choices are to reduce timing or add more fuel.