The good news is I think you probably bought the right spine. If I were you I would try to find someone near you who knows what they are doing as far as tuning arrows goes. In my opinion carbon arrows are the toughest to tune. Having said that I think if I were you I would do as TJ suggests and not worry about it yet if you are new to shooting. Use one shaft and leave it full length. Just shoot up close and get your form down. However if you want to be able to shoot and not worry too much about tuning arrows yet then just get ahold of a couple of aluminum shafts. 2016's will probably shoot perfectly out of that bow.