Lessen learned. DO NOT use an impact to install your wheels unless you have the torque sticks. Even then, if you're buying nice wheels torquing them down with an impact wrench doesn't take that long and can save damage to them from an impact.
Your not driving a race car and trying to get out of the pits as quick as possible.
When was the last time you checked the torque on the wheels? With aluminum rims I check and double check them after 20-50 miles of driving just to make sure they haven't loosened up.