Good questions. To be quite honest with you, in the fall I primarily target the same combination of structure: A cove with a defined creek channel, right off the main river channel, and with plenty of structure. When I say structure, the more the merrier...lots of laydowns, stick ups, brush piles. This combination of structure will hold fish throughout the whole fall season, and to me, is THE best place you can fish. The cover in the cove gives the fish plenty of ambush points to catch any kind of unsuspecting prey that may wonder by. That being said, I'll flip, pitch, swim, cast, and hop the jig next to any cover, whether it be a laydown, brush pile, or a creek channel. These fish are hungry, let them tell you how they want it.
No presentation is a bad presentation. Fall is a very forgiving season due to the fact that these fish are gorging. Experiment and figure out what those fish want!