The best strategy for doing any ride at rope drop is to head to that ride at rope drop and get in line. It's just a matter of hoping for Ministry to open in a timely fashion. Helios gives you a nice edge to easily get there before the front gate crowd. If it opens right up, this is fantastic use of your rope drop! If not, it still is normally an ok use because the longer Ministry waits to open, the more god-awful the line will be 3min after finally opening. (On my day it opened around 10:30am and the line shot up to 3hr+ immediately).