Dont know if this will help but! i been training spaniels for 15 years now and nine times out of ten poor retrieves are down to over doing it,now i know nothing about lurchers but it goes for most dogs 2-3 retrievs is more than enough during training for a spaniel per training session,my training sessions only last 20mins anight and if he/she doesnt behave they dont get the retrieve at all .they soon learn if they do as they told they get more retrieves,but saying that i always start my young dogs retrieves standing (throwing) send the dog then kneel down and give her the whistle to come back