i have the cure for this but you need someone to help you, if for example your doing lat pull down have someone stand behind you and put a little upward preasure on your elbows don't focus on monving the weight focus on pushing there hands down with your elbows, envision that the weight is not coming from the stack but from the resistance they are pushing against your elbows, doesn't need to be much just enough that you can feel them, it will work with everything seated cable rows single arm d.b. rows, however if your helper is a guy and your a guy i wouldn't sugest using this for bent over rows or t-bar rows as it may look like your either getting pluged in the but or goin for extra protien in the front
p.s. use your normal work out weight