http://starwars.wikia.com/wiki/Dark_Side_Cave This may help, i personally think you have to use a certain power in there, or get all 16 people to do a specific thing.

Im not really sure what to make of all this. I dont want to sound like a complete troll but i went 31 into vigilance 8 focus (level 48 atm), always in sorensu for surivability and have had no problems. If you gaurd most times you get 3 medals off the bat, for damage absorbtion. I really dont think that spec is the most important factor always, i think its how you play, by a gaurdians nature im not sure hes meant to be the be all and end all of pvp. I feel like saying why dont you roll a sage of a commando or something abit more op. I find that i come top of the allies leaderboard with just playing to help the team, stasising people so others can kill them doing as much damage where i can. slowing the enemy down or helping people on low hp. If you keep re-speccing your never going to get used to your abilities and find the best rotation, i overlooked alot of my abilties at first but it takes alot of time to know whats best, the JK IMHO is a very situational character we cant just spam lightning or stuns etc, theres alot to playing a jedi.

What form are you using?

I have to respectfully disagree. Mostly because though what you say is logically and factually true. In game it just doesnt work that way, yes they have a power that gives them 99 percent damage reduction but it costs 50 percent health to cast i believe. Whereas the gaurdian can takes its defensive stance recieve half his armour rating on top of what he already has, reduce damage taken and generate focus by taking damage. What does that cost to him? The 6% damage increase of using the other form is all i can see. what the sentinal needs is a push pull mechanic imho. Im not saying any of the classes are bad or op its all gunna come down to so many other variables but i do think the sentinal needs to be looked at slightly. The commando i think it is, seems to have the best of all worlds as it stands heavy armour, push, pull, cc, high damage but bioware will make sure everything works out im sure.