Right then!
Im not sure I've ever encountered a pint that wouldn't settle, maybe I just haven't had enough of them! Ive seen the opposite many times where you get an anaemic pint that just about makes a head, and obviously the pint with too much head (har har)
I'll have you know that I was awarded a certificate in Guinness pint pulling one year by Guinness! The gobshites sent a quality team down to the jazz and into the main venues on the Thursday to make sure the quality of the pint being served was adequate. The thing was that we got to drink the ones that hadn't worked out perfectly so it took a while but eventually everyone managed a good one and got awarded for their efforts. No one mentioned soft pints at that either though