Anti pull harness, what's the best?

[markys]

We have a 12 month old english pointer, he's about 30kgs and still growing. We have tired a halty harness and a Mekuti one, neither have stopped him pulling but have helped. The halty is worn out now and he can escape from the Mekuti one when he's wet, so does anyone have any suggestions on what to try next. Ideally it could be used on a long lead.