If I was going to follow somebody's keep it would be Robert Lemme's maximum stress keep.No spring pole, flirt pole, weight pulling just handwalks and short intermittent mill sprints.WInd wind and more wind everything else the dog needs if it hasn't got it naturally you're not going to really improve on it.
I don't know much about it but he seemed to be a fountain of knowledge and trains athletes with the same idea!! I liked the part where he talked about rescuing a Dog that lost, he bought it for 50 bucks and once he got it fit it won after it was previously written off as a cur... Nice story