Healing has been our weakness also, but we've really been trying to improve it. Technically you want the dog looking up at your shoulder, it makes the turns and about turns much easier. Picking up the pace has also helped as the dog has to keep up and gets less distracted.
A friend who is very successful in the OB ring has been giving us help on our healing. She has us healing about 5 steps at a time and if Princess is in the right position and watching we stop treat and praise, when doing about turns the same thing, but if she drops her head we give a slight pop and treat when she is in position.
Hopefully we will finish our UD next month and move into the B class, but unless our healing gets better we won't stand a chance against all those damn Border Collies and Golden's that just stare at their owners.