Results time:
Short answer is it works
Though a Single 80 did not have enough SCFM for operate my impact wrench (5CFM @ 90PSI) the Air ratchet worked fine (3cfm@90psi) with the original setup.
In the end I doubled the supply 2x80cuf 2 old regulators (one Blizzard & one conshelf) that mate into a Omniswivle 2-1 adaptor I had lying around, this then converts down the 1/4NPT into the in line Air Regulators for Air tools.
This setup operates my impact wrench with no issues
I think the flow issues is at the tank valve and not the regulators/Fittings (I am not using any BC QD)
I think I'll end up taking the plunge on a compressor in the future, but this allows the use of air tools without one for the time being.