On the bubble w/ dead stack

[Ixnert]

From a Party 20+2 last night:

Blinds at 100/200, stacks as follows:

3800
1400 (Hero)
2000
800

At about the beginning of the 100/200 blind level, the 800 stack timed out, and after a few minutes, it became clear that he very likely wasn't coming back.

The 4000 had been calling huge raises with trash the whole time, and had been catching his 3 and 4 outers to build his stack.

So, given that (1) I could fold into the money with almost 100% certainty, and (2) I expected to have to play almost any hand that I entered the pot with (virtually zero FE), it seemed pretty obvious that I should tighten up.

The real question was: how much? If I simply folded every hand, I'd have about 600 chips once the small stack was gone, and virtually no chance at anything but third. I suspect I tightened up too much (I never saw any truly premium hands, but I did fold AQs a couple times, along with mid-high pairs, TT and 99 at least once each, hands that I'd easily play 4-handed normally), but how would I go about figuring out what would have been correct to play in a situation like this?