Richard the fish have only moved to 16m because for one the poles are now redily available at that length, and two that old art of coaxing fish out of the features is long gone,
Sadly people will insist on feeding the reeds or the far bank features and of course fishing there, after all who is gonna go serching for food if it keeps getting delivered

Don't be too concerned about fishing at length its not always the case, especially as the water temperatures warm up, the fish become more active matches get won down the edge or even 6 metres,

good luck with your switch, im just getting back too after 9 years

JC