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Engine tech. Well, arghx7 copied a chart from the 2GR-FSE technical paper that showed the port injection/direct injection usage map. We dug up some info on how VVT-i is controlled, and found that there is a large amount of internal EGR going on for emissions reduction apparently, and the particular way that they set this up could be affecting midrange torque. However seeing that torque is very strong at 3000rpm suggests something else is at work.
However it could just be an intake/exhaust tuning thing, in which case you probably can't dial it out in the ECU.
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