Man that sounds like home to me. I'm no pro, just a fisherman. Here is my view. I'm interested in the 40 acre part. The bend of the river sounds like an excellent place to start. The deep water being close to the shallow sandy area, is where I like to fish. The crappie during this time of year will be moving in and out of this deep area before they spawn, more than likely. I usually spider rig right off of the drops. Or just slow troll. You can use a multitude of jigs, but my favorite presentation is a double rig. You could only use two poles, easier to handle, but I put a horse head spinner on the bottom and a minnow or other jig 24 inches above on a little 4 inch tag or loop. This slow presentation usually finds them for me. Keep watching for them to spawn on the shallow sandy flats. For the other spots you mentioned, I usually hit the tree tops during the spawn and warmer water. I usually do this with a long pole and jig or minnows, dropping them in the tops. Also a white or chartruese road runner works well in dark water rivers on an ultra light. Like I said I ain't no pro, but this is what I do. There really isn't a set way to do it, but if you fish it you'll get some. I hope this helps.
This only my opinion, but nothing you can say will change my mind. That makes it a FACT.
Today is a Blessed Day and a Prosperous Day