I want to buy a decent impact wrench but I am realizing my compressor is not that great.  I have a 5hp 26 gallon tank rated at 6.6 SCFM@40PSI and 5.8 SCFM@90 PSI.   
  
If I run a length of 30’ 3/8†hose from my tank to another portable tank, 15 gallon or so and then a very short 3/8†hose or bigger to the new gun, would I increase the potential CFM directly to the gun? 
  
This is for the home garage obviously.  I just want to create the best “oomph†for occasional high torque demand, without going out and buying a new compressor.