Hi Dan. not sure you are still out there and active on the site, just saw one of your old posts and you were talking about yellow Javelin lure , I'm not sure what they look like.
also I haven't seen any where information on when duct gates are timed to open. I think they open around 7 or 8 pm. and close down early in the morning . i have tryed all kinds of lures out there and white getzits and L Rattletrap work fair to good at times. the trick is to find a sweet spot to fish.
I hope your doing ok out there, and to hear from ya sometime.
Sleeper403