Digi lag is not the same as turbo lag. The car doesn't come into the powerband until you hit over 2750rpm anyway.
Digilag is the hesitant-ness you get for a second or so from when you press the throttle to the car actually responding. this can be cured without chips and the like by slightly adjusting the AFM carefully. Esentially you need to remove the cover off the AFM so you see the clockwork internals, clean them up with electrical contact cleaner first (if there are heavy tracks on it you might wish to replace it as this will be part of the problem ) if you carefully undo the little bolt whilst locking the mechanism in place you can then adjust the main cog clockwise by no more than 2-3 clicks. If you adjust it to much or dont have it locked when you undo it, it will unwind completely and it'll be buggered. I'd suggest using a spare one to do this to and then fit it. That way if you've done it wrong or mess it up, you can just refit your original one.