Has no force

The impact wrench is just sufficient for most wheels that are tightened with 110 Nm, in my car but there are 135 Nm and he does not get on. The stated 340 Nm I can not understand completely.
I have a sufficiently powerful compressor, which supplies more than the required amount of air, and I have a 1/2 "hose risen since the thin hoses not enough air flowing.
The manufacturer makes it look easy and has pointed out that torque and loosening torque not identical, but if I can not solve any screws that are tightened with 135 Nm with 340 Nm Impact Wrench, the argument is kindergarten.

Quite outstanding was here but the Amazon AZ Warranty Service, which has stepped in promptly.