Both you and the small blind have the same amount of chips and are the short stack. Tattoo Wife is also not looking very good, at only 2400 chips. The only big stack has about 7000 but even though he is the big stack, if he calls an all in from any of the short stacks and loses, it will hurt him. And both you and the small blind don't have an M of 4. You have an M of 1.6. You have to take your M and multiply it by the number of players remaing divided by 10. So 4 * (4/10) is 1.6. Once youre M is this low, almost anything justifies a move at the pot.
So even if the small blind hadn't been stealing your big blind every time and had been fairly conservative, you still can't be giving him credit for much of a hand here. He may be raising you with hands like king 3 or queen 5 offsuit. Just go over the top of him and when he calls and turns over some average hand like 10 8, know that you're a favorite to double up to almost 4000 chips. Remember, ace 8 offsuit is in the top 20% of all hands. I would probably fold an ace 2 offsuit or an ace 3 offsuit here, but ace 8 is good enough to push.
If you fold here, you'll be at 1500 chips, and next hand you'll be in the small bind with 1350 chips. The big blind will most likely call you with any two cards, since he has such a big stack. If you fold in the small bind here, you will be on the button next hand with 1350 chips, and when you push all in, you'll have to go through two random hands instead of just one. In the earlier situation against the small blind with ace 8, you are only against one random hand.