Hi Martin.

I made a visit to your site a while back ..September last year I believe.

Tescom and Goreg are popular high pressure / high flow air regulators .... whose make and model/specs do you use?
You say that your using 2 off ball valves , couldnt you have used a T or L ported ball valve?
How fast can you open the ball valves? ..... etc.
Cheers Woody