Send me that photo - I might be able to post it for you and I have a little experience with topo maps too.

I hunt a WMA here in Arkansas, 90% flooded (although average depth is probably only 1-2'). Its hunted hard, and the big boys love to wade/swim out to little island like high places, right in the middle of the swamp. I've always had this thought to find one being used (beds/scrapes - just obvious fresh big buck sign)and hang a tree stand nearby, and be there an hour before daylight and sit there all day. Just a thought you might want to explore yourself. Those bigger, smarter bucks - they're going to go into the thick stuff and bed - thats their sanctuary, and unless the rut has 'em going, thats where they'll be.