Common Stud 8 situation

[fnord_too]

On third you complete with a pair higher than anyone elses door card. You get one low card call. On fourth villain catches a low card, but not a good one, you catch low. Bet call. On fifth, he catches another 'bad' low and you catch small, now with 3 to a better low than his low. Do you continue?

Example:

You (Q3)Q26
Him (XX)387

What if your up 2 is an 8 (assuming the above is a continue)?

I have found myself in this spot a couple of times lately. Should I be checking on 4th if he catches decent and then check folding fifth or continue to drive?