no, a metal loop wouldn't be better. if you want to offset your loop a bit, get it where you want it and stick some needle nose pliers in it and open them up as hard as you can. it will lock your loop in place. the situation is that depending who made the string, it may be settling and 1 adjustment is all you need, or it may never stop getting longer because it is slowly slipping apart because of construction methods, or just a mistake someone made.