2 cans of concentrate should not make it too sweet, but usually I just add one.
Really, just shake up the keg, pour a half pint and put it aside, then pour another pint. The first one will be what was built up in the line. The second one will be the mixed up one. Compare them.
If it is still too sweet, back sweeten with only one can.
In Primary: Belgium Chimay clones.
In Secondary: Braggot, pale ale, end of the world white.
Conditioning: Mead, Cider, braggot, Belgium Wheat.
On Tap: Clones, Chimay Blue, Red, Porter, malted cider.
Bottles: Far, far, too many to list.