Depending on your exact set-up (where the temp probe is, length of line, placement of taps, whether you have a fan etc.) there can be a very significant difference between the set temp and the temp at which the beer actually flows into the glass. Might be worth My converted chest freezer is set to 3C but, once the taps have cooled, pours at around 6C, which is a decent compromise for the majority of beers I brew, but still a compromise. One day I plan to have 2 compartments with one pouring at more like 10C for all the English ales I brew. Or maybe just another 6 keg chestie