Yep. You need to increase your serving pressure to the same pressure you used to force carb the beer (assuming you did set & forget, i.e. carbed somewhere in the 12psi range -- if you carbonated it at, say, 30 psi and left it there a week, well then your beer is WAY overcarbed).
Say you carbonated the beer at 13 psi at 40 degrees. If your kegerator internal temp is 40 degrees, you need to keep the regulator set for that pressure. If you find your beer is pouring really quickly and full of foam with the pressure set at that level, then you need longer beer line.