If you're losing money don't play 600bb deep.
If you're prone to tilt don't play too deep, as mistakes are really costly when playing deep.
Edit: I'll add some explanations maybe.
The more money you play with and the more decisions you take in postflop play. If you are losing money and don't know why, there must be leaks in your game you didn't find yet, and therefore couldn't correct.
The main advantage in playing deepstack is exactly the fact that you will allways be able to play for big pots if you want to. This means that all the money decisions can be as costly as you are deep.
When you play better than your opponents, it means that they do more mistakes than you. Therefore, playing for more money -hence playing "deep"- will lose them more money (and win you more).
If you are losing money, it means that for the moment you are overall taking costly decisions over beneficial ones. Playing deep will just make these decisions more costly, just avoid for the moment, it is really the safest way to go.
When playing deep, a lot of complexity kicks in, the strong hands are not the same ones because implicit odds are different. Depending on how deep you are and how behaves your opponents, you will have to adapt effectively to the game. Just don't bring too much complexity on yourself. Poker is already complex enough, don't try to solve everything at the same time :). Play standard bigstack, avoid playing with more than 130bb (don't know really about when we are considered "deep", but I find myself starting to be confortable at a table when having around 150bb (god I LOVE playing deep!).
Good luck at the tables, good learning during your session reviews, and feed well your mindset 
X( 
