Where did I go wrong in decoding SSTV using Goonhilly WebSDR?

I was not getting good SSTV pictures from the WebSDR at Goonhilly Earth Station, even after timing well and receiving strong audio signals during SSTV transmission. It was only later that I found out that it was because the mode selection was not on FM and the bandwidth was just at 2.5 kHz, possibly for CW. After selecting FM mode and increasing bandwidth to 25 kHz, fair pictures were obtained, though not that good because it was near the time for loss of signals (LOS).