Bread-Bakers v110.n011.1

Do you all have a "rule of thumb" for adjusting recipes when baking 
in these things?  The pan insert says to adjust 5 or 10 minutes, but 
it doesn't say in which direction.  I've been making popovers (had a 
craving) and they've been coming out ok, but I wondered if they could 
come out better.  I've been cooking them for 5 minutes less than the 
usual recipe instruction.  Also, if anyone has favorite popover 
recipes, they would be appreciated!
Thanks,
Elysa