Andy.
At this time of the year I would probably do away with the groundbait for the canal. What I find works a treat it to fire a small pouch or two of micro pellets in down the track (boat chanel) to get the swim going. Thereafter I would feed an even smaller pouch of micro pellets in about every 10-15 minutes. Fish a 10 mil pellet on the hook.
I found that a single piece of French Maize on the hook sorts the better Bream out.
Spread your bait over a diustbin lid sized area.