Ok try 5-6lb Maxima original, 6lb Maxima is tow rope it will break much higher than it stated breaking strain, I would not use any heavier than that because it coils. That's my recommendation, but I have to say its way too heavy for canal work.Light method or float work, commercial lakes and canals.....
Have you tried Shimano silk shock,? Its a very good line,All round? At one time I would have said Daiwa sensor but last year I needed some 8lb mono and it wasn't in stock locally so I picked up some Shimano specimen and I now think it's spot on for my needs. I've had Tench to near nine lbs, some lovely Barbel and BReam , all or most at long range .
Recently my direction / target fish has changed to some roach and I have been using Shimano match -- can't fault it .
Try both, hope this helps.