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I don't see how you can call on 5th.
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Yeah I'm thinking calling 5th is bad. No matter what I catch on 6th (save possibly a 4), I'm still likely playing catch-up in at least one direction. If he doesn't have a made low, he's got a pair and a low draw that's at least as good as mine.
http://twodimes.net/h/?z=2933594
pokenum -mc 500000 -7s8 7s 8c 6h 5h qd - 8d 6s 5d 7c 6d / qh tc 9c 3c qs td 2h
7-card Stud Hi/Low 8-or-better: 500000 sampled outcomes
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
7s 8c Qd 6h 5h 77255 173921 303582 22497 208558 88809 26766 0.427
6s 7c 8d 6d 5d 145814 303582 173921 22497 207798 88752 26766 0.573
Fortunately he finished with a 9-high straight and no low. My awful 87653 low took half.