Is your current approach working, if it Is then I wouldn't change anything.
Amount of feed is individual to every lake (number of fish, pest fish, birdlife etc) and to every angler. Some anglers will use high attract singles or just stringers, bags and some might apply plenty of prebait and to try and trigger a feeding response.
Try and find out about previous wintrers on your chosen lake, what was caught and from where etc. Might be a certain swim or area that do the fish etc.