the difference between st and hullbreaker is that st quite literally has players of all classes and roles just waiting to get in, hullbreaker is a 4-man that might not have as many queueing for it and has less chances for people to come in because they are already past the boss that you want loot from. in last nights run of st, a healer and dps dropped from my alliance for an s rank, they were replace within seconds. i highly doubt that you get that kind of time on hullbreaker, or most any other content.
