*sigh*...
Listen, you obviously won't stop posting after getting advice several times from other patient posters... PLEASE, read up on the subject. There are many points aside from grammar that make your post wrong.
1) If you have been 10 hours in a casino, you can't have played 4000 games. You can't even have played 4000 hands of blackjack, which is what I suspect you meant.
2) Most casinos won't allow you to play 7 hands at once. If they do you will have to bet at least 7 times the minimum, which will be just weird, because you say your bet is 20$. Or what did you mean you play 7 hand? Do you mean you play at 3rd base?
3) Where do you get you .9% edge? Can you please elaborate on the rules? That really seems quite high. Even if you have early surrender you never get a .9% edge. The fact that you betting unit is in $ seems to indicate that it is an US casino. Which one? Is it an Internet casino? As BJ_Player2004 says: Please explain your advantage!
4) You have played 10 hours and lost 150 units. Quite a bad run of cards. If you get 100 hands per hour that of 1000 units bet you have lost 150. Quite bad, but since your post does not indicate any counting I'd say you just caught a bad run of cards. Ahem, I'll just refrain myself from any other mean comments...
I don't mean to be picky, but being a foreigner myself, I would appreciate some better grammar skills and some netiquette. You cannot just barge in like that and ask a bunch of questions, post some false systems and never ONCE answer correspondingly to all the patient posts that people have been writing to you. Until you finally explain yourself better or learn something you will not get much advice in this forum.