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You've just described it perfectly, Google 'fishing a stick float' and the shotting pattern will be explained. 6lb main line, 5lb fluorocarbon hooklink about 10" long and a bloody great lump of flake squeezed around an equally bloody great size 6 hook. It is possible to trot (allow the float to trundle along with the current) with a fixed spool reel with the bail arm open, but a free running centrepin gives much better control.
I have now had over 20 chub in 5x 3 or 4 hour trips, only 3 of them have been slightly under 3lbs and 3 above 4lbs. Have another 4 plus!
I fished 5 swims and caught a 3lb plus chub in every one, I seem to have been gifted a a goldmine. If I looked at a swim and thought that a chub should live there, it did. Everything caught on trotted breadflake, it was like turning my watch back 50 years. Yes, I do know how lucky I am.