Is it just me, but I have a 2011 edge with the 3.5 and it seems to have a lot more power at lower RPM with the a/c on. My 2015 3.5 seems to have no power at low RPM. Between 20-40 MPH. This seems to be only with the a/c on. Anyone else have this problem? There can't be much difference between the 2 engines. I heard that the 2015 is supposed to have more horsepower too.