How many times does this need to be repeated? NHL teams DO NOT shoot at 13% at even strength over the long haul. Say all you want about injuries, changes in tactics, new players, old players. It just doesn't happen.
The best shooting team in the NHL since the lockout was the 09-10 Capitals, who were absolutely stacked and still only averaged 10.4%.
Most fans want to craft a narrative about things - eg, the Rangers are shooting so well because of great passing and team chemistry. Then, when their luck inevitably subsides, people will start talking about how the team lost confidence and this injury or that injury screwed up team chemistry. Except, all along, they were an 8.5 - 9.5% true talent shooting team, who just happened to experience some variance, for whatever reason or another, at different points in the season.