Good enough to make a move?

[StoneRose]

2 table NL $20 tourney. I have been playing fairly aggressively at the final table. Blinds are $75 / $150 and I have about $2000. There are 7 players left. Two players at the table have $4000 -- the rest have less than or the same as me.

1st hand:
I am in 3rd position.
1st player folds.
second Player goes all in for about $1000.
I have 8-8 and raise All-in for $2000.
Everyone else folds.

He has 7-9. The Board comes Q-10-Q-10-3 and his nine high beats my 8 high. I have about $1,000 left.

Second Hand I get A-J. I am Second to act I raise All-in for about $1,000 and everyone folds and I win the blinds.

Third Hand -- I get A-8 offsuit and have to act under the gun. I have about $1,250 and the blinds hit me next at $75/150.

Do you think I should move all in against 6 other players for the third time in a row, or fold because I have been so agressive and a lot of people have a chance to enter the pot -- and A-8 isn't such a great hand?