The VC-T engine is completely foreign to everyone. So tuning it will come with some trials and errors. If you take it to a good tuner, he'll know how to handle it accordingly and not overstep some boundaries. You can get power out of any engine and still have it reliable, Manufacturers have to play it extremely safe which is why there's so much open room to maximize.
That being said I'm not saying to go and squeeze every horsepower out of it, but you have play room.