Blind defense, Short Stack vs. Short Stack on the bubble

[sofere]

What type of hand do you need to push back over the top to defend your blinds?

Hubble min raised everytime I was BB and it was folded around. How often should I push back and with what hands?
I was waiting for any PP, Ax, Kx, any suited connector above 4-5, any connector above 8-9. But the hands weren't coming much in those situations. After the 3rd time or so should I push back with any two?

BTW this was Stars 5.50

Seat 1: mabrenna (2540 in chips)
Seat 5: Idachamp (7575 in chips)
Seat 6: hubble (1860 in chips)
Seat 7: sofere (1525 in chips)
hubble: posts small blind 100
sofere: posts big blind 200
*** HOLE CARDS ***
Dealt to sofere [5d Jh]
mabrenna: folds
Idachamp: folds
hubble: raises 200 to 400
sofere: folds
hubble collected 400 from pot
hubble: doesn't show hand