Fermentation temperatur is 20 degrees till 50% attenuasjon. Then temperatur is to be decreased to 17 degrees into end of fermantation. When the beer has reached FG. Temperatur is decreased again to 6 degrees till the beer is ready.
Gassy beers are much more difficult to drink in quantity and proper carbonation level is even more important for low gravity beers like bitter. Too much carbonation in a low gravity beer results in a harsh, carbonic bite. While carbonation is important to filling out the mouthfeel of a beer, and it helps drive aromas up to the nose, too much carbonation can make a small beer seem thin. Target a low level of carbonation, around 1.5 volumes of CO2 for bottled beer and 1 volume of CO2 for cask conditioned beer. A typical American pale ale is carbonated to around 2.5 volumes of CO2, so cut your priming sugar in half at bottling time and you’ll be close to the right level of
carbonation.