I admit to being mystified by harness systems. Wouldn't it be easier to train dogs to walk to heel? They get the idea within a day or so and they know when they're taking the piss. Sure, it takes a lot of positive reinforcing and quite a few sharp 'nos' and 'dog heels', but life would be much easier in the medium term. My mob walk pretty sensibly held on rope slip leads held in my left hand without pulling.
My pair of cockers will get away with anything they can, one of the labs pushes his luck as well. Don't let the bugger get their own way and all will be fine. Mine are actually easier off the lead, but people will expect to see them on the lead at times. In short, persevere.
I admit to being mystified by harness systems. Wouldn't it be easier to train dogs to walk to heel? They get the idea within a day or so and they know when they're taking the piss. Sure, it takes a lot of positive reinforcing and quite a few sharp 'nos' and 'dog heels', but life would be much easier in the medium term. My mob walk pretty sensibly held on rope slip leads held in my left hand without pulling.