FWIW, the first beer after sitting for a while will have more foam, as the beer in the tap warms while sitting. Me, 2.2 to 2.5 volumes, 10-12 psi at 45ยบ, 12 feet of beer line. What I am doing now is to have a glass by the taps where I put the first 3 seconds after I haven't tapped for a while, put it aside and tap away. Eventually that foam settles down to liquid and I add it to the third or fourth beer.....