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im out of ideas. did you ever check your wastegates? make sure there not leaking or not adjusted correctly. since there are two of them there difficult to get in sync with each other.
that would make sense. if there leaking its going to increase lag. each wastegate should have a sealing ring that mounts under the wastegate plunger. if this sealing ring is missing they will not seal at all.
it has been my understanding if you were to use a 50 shot of juice it will not only help you out of the hole but it will help you spool up faster.you only need to back off 2* of timing per 50 shot of nitrous ( it will help a lot)