Serving pressure depends on the system for me. The jockey box I have been using needs about 18lbs for a good pour. Much less and it's pretty flat. My kegorator likes 12 or less depending on the beer
With the JB the high pressure if the CO2 is left on does not over carb the beer. Go figure. I have to assume the plate chiller makes the lines much longer than they appear.
Gotcha on the bite. Beers that have been way over carbed then "fixed" get a soda type fizz that never goes away. Even when the carbonation is back to a normal level it seems to stick around. I do not dump them out of course.