I just saw the thread relived on the whats new.
I was with Rene Wiese often on his SfA stand at the various hunting shows in germany, basically helping him out as a payback to him for having helped me out on my Jagdscheine course in 1998 we have became good friends too.
His best tip to me was to always have some white paper hankies with you so that if beast runs off after the shot you can mark the shot site by sticking one of the hankies onto a stick then push said stick into the into the ground, simple but effective. Do not trample up the site too much as it confuses the hound.