Mogul

I have just fitted Gaugemaster DCC23 6 pin chips to two locomotives, a Heljan 1366 and a Hatton's DJM 14xx. The 1366 runs like a dream but the 14xx is very jerky at low speed and when setting off, it ran fine on DC while running in. The default acceleration and deceleration on the DCC23 is 0 but I've changed it to 4 which worked for the 1366. Has anyone else fitted DCC to a 14xx, have you had to change the CV's?