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Er, did you run more lean? I don't get why your exhaust map looks like that at all btw, why don't you start with the stock one and change the cells one by one?
You basically want to shoot for ~3-5% hot exhaust dilution (typically the OEM shoots for 10-20% on a double VVT engine) and as high of a lambda as possible. It's like running a high cooled EGR dilution rate but with air.
That's however assuming you have free control over lambda and are able to run richer at very low loads where fuel isn't burning as quickly. If you are limited to a lower lambda for practical reasons, then you want a little more exhaust overlap. At any given speed and load, you know you've reduced internal EGR if you reduced overlap compared to stock, so I would look at the maps in "difference" mode.
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