Talk to a tuner, or do some trial and error on your own. You'll want to see how low you can get your injection rate (your injector pulse). Not much is going to help with low end smoke better than that stock VGT.
If you're asking about what size charger would clean it up at max output, that's a different question. I'd guess something north of a 78mm, but... you could mkae smaller chargers be smoke free by limiting fuel via tuning.