Eventually, you want to hit the derestricting thread and get that tune installed. I run that one with a Ramair and my bike is on the leaner side, but by no means too lean, judging by the state of my spark plugs. The change in power is worth it, you literally get 30 horsepower and the bike revs to 6000, not 4000. I mean, sure, you can rev past 4000 if you want to with the stock tune, but there's no point, since nothing happens.
But I would definitely break the bike in first, if I were you, and the TORS tune from Triumph is probably not a bad idea.