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I would think it would be the opposite....bedding in swamp during day and leaving to feed around dark?
keep after it . the more time in the woods the better your chances but seems like your in the right spot your luck will turn. toss on some waders and explore that marsh a bit better, see if you can find some bedding areas or jump that buck out of there during the day.
Deer are primarily nocturnal critters. They don't do too much during the day. Better to stake out the trails going into the swamp, and catch them going in to bed down.
However, I have heard lots of activity in the marsh early in the morning (6:30-8:00am). It may be my imagination, but it really sounds to me like large animals entering and /or exiting the water in the marsh.