I usually hunt public marsh or swamp. That transition point. . where is that ?
Can you describe more ? How many acres ? How many access points ? How much traffic by hunters (deer and others). What is around the swamp, besides that factory.
My particular bit of marsh sounds very similar in construct, except it is in the middle of the country (no factory). In mine, those high ground (buckthorn, birch, poplar areas) are indeed pass thru's and that is a fine place to ambush them.
Over time and a lot of observation, you will find that the deer come from certain directions at certain times.
You can catch them moving and be very successful, but you gotta know when and where.
I have also been using a Rancho Safari ghillie a LOT out there and I like to find a location in the marsh grass where a trail passes within 15 yards (or ten, or five) and set up. I make a nest in the grass large enough to hold me and allow movement. From deer's height, they will never see the "nest".
I like to allow for several shots, cutting or knocking down the grass to allow for both a shot as well as for the deer's head to be eclipsed.
I like to arrange my seat such that I am ready to shoot in the most likely direction. I can move a bit.
From the deer's height, I am covered by natural grass up to nearly my shoulders (when seated), so make that nest open. . but make your entrance opening come from some direction that does not allow them to see it.
Make the nest downwind from the usual wind direction and ONLY hunt a good wind. Approach from down or cross wind only.
Walk in slow, just a step at a time, no hurry. Yeah it takes time, but where I am, the deer aren't moving till the first or last hour anyway (I hunt evenings).
In the nest, I throw down a 2-3' square piece of decent grade indoor outdoor carpet, like in a bass boat. Get a scrap, color doesn't matter. On this, I place a small stool (I use a three legged folding stool). Not so comfy, but I can handle anything for a few hours. . right ? The carpet keeps things quiet, keeps the stool legs from sinking into the mud, and gives you a place to set your bow tip down on, as well as your fanny pack or other gear.
Skeeters bad ? put a thermocell in your nest.
I find the deer in my area use the back of the marsh for bedding and move thru the higher areas to find different browse and as a trail to get out of the marsh. Find the right trails and you can do well.
Over time I have scouted the area quite well. You need to, because it is a growing, changing environment, and last year's good areas are now empty because the overstory grew too thick and wouldn't allow the understory to grow this year and it is now wide open, or a storm blew several of the bigger poplars down two years ago and this year there is lush growth where there was none.
ChuckC