Pipe I agree w/what said about not allowing this guy to put his paws atop the gunwale since he's proven he will go...let your wife take the wheel, keep the trianing collar on him and ride around w/you conentrating on giiving him that little jerk w/strong command NO and he'll get the idea...then later on, give him the permission as you mentioned...I like the vest, too!!...
20+ years ago I hooked up a 25lb jack Fish in FL in a 16' jon boat...1st time I got him to the boat, 3 Jack Russells and 1 Black Lab went into the water...fish ran...w/landing net, scooped up Jack Rusells and behind the neck levered lab all back into boat...2nd time fish to boat, only 2 Jacks went in and by the 3rd time, they had figured out better not do that again...Chinese Fire Drill for a little while...
I glad ya got yer guy back in the boat...