WATCH FOR BITE TIMES
I AM a massive believer in timing every cast in the cold. The main reason for this is that even on the coldest of days, provided I can get a bite or two, there will almost certainly be a pattern to how long the feeder has been in the water when a bite occurs.
Once you start to see a pattern emerging, you can use this information to fish more efficiently. If most bites are coming between 8-10 minutes then there is no reason to leave the feeder out for 20 minutes.
Next time you’re out, try timing every cast and I bet that before long you will start to see a pattern emerging which you will be able to then use to your advantage.