I just made my first beer in a keg. It is quite flat, even though I first used forced carbonation and then I let it stay on 14,5 psi for 2 weeks. In a different forum, they say this is because the beer is over-carbonated and that all this CO2 is released when I pour it into the glass. I thought over-carbonation would cause foaming, but it apparantly not not happen if you have a beer dispnser with a 2m long 3/8" tube. Can someone elaborate on this ? What happens? Is there something I can do to fix it?