i dont see the need to take eca or at least ephedrine its metabolism boosting efects are from boosting your t-3 lewels and since you are taking t-3 save it for when you come off
as for clen i would find the right dose and take it all the way trough, at least it worked for me that way you can always tell with clen id take enough to have the shakes or the speed like buzz through out the day if it wore off id take one more tab if it came to the point where it didnt do it id stop taking it and wait a week