
I agree with you and believe that a harness either encourages a dog to walk in front or even worse, to to pull. I don't think I have ever seen a harnessed dog walking properly at heel!
Have you considered a "Halti" (a genuine Halti not some other make ). You will probably find a resistance and dislike of this being on your chaps head in the begining but as with a collar they learn to accept it.
Used properly and certainly
not tight a halti can be a very gentle item to use, even the most determined dog should learn to respect one. The reward is a nice loose lead and a dog happy to walk with you and not in front or pulling.
(If a horse or cow can learn to walk and be controlled with a halter/headcollar then so can our dogs)
Just a suggestion to Jan!