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the fact that it starts exactly at 2800 where the stock oem tune switches to DI only at relatively low loads, makes me think of problems with the DI itself
Can you try to floor it heavily at 2000 rpm instead of give partial throttle?
like 2000 rpm floor it 100%... if you are quick enough it should still cover the zones where it uses 50/50% of injections at least untill 3200 rpm, so the esitation should begin a bit later
in the case it is the DI, don t really know how to help you, maybe some DI injectors is clogged up or faulty
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