Buy a battery-op aerator and clip it on a bucket, if you don't have a live well. . .that'd be the quick and dirty fix. Gotta keep the live bait lively.

As for early morning or middle of the day, I have never found any difference in their activity patterns in terms of ambient light. I've screwed around with scents too, and haven't noticed a difference either. It seems to be mostly tide dependent. . .some movement, but not too much. Whenever I fish at slack, I have found lings to be really sluggish. I think if they get to stare at something long enough, they get disinterested. I'm no authority on the subject, just my observations. I hope to do gather more data soon!

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