I would order a couple dozen 120s…

110's in the air will take care of them pretty fast. You should be fine with the small diameter poles. Canadians with BMP rules would disagree. In cold temps. on skinny poles, you will be fine.

Snuggy is the easiest clip for what you want. You can buy them with the screw or supply your own. 110-160 size or 220-330 size. I suggest the small ones and use your own screw if possible. Nails suck hitting between the clip edges, use screws. Snuggies can be bent in or out depending on your trap. A really nice improvement over say a Barkers or MTP.

Boxes facing up. Some do, some don't, some like me, put them horizontal on a limb. I never put them on the tree trunks up or down. Always on a limb.

Not sure about how many marten you have, but double up on traps for sure. Sounds like you have plenty. I would space them 1/4 mile or closer if you have water or marshes nearby. If a creek, set both sides, two traps per side since you have the traps. Yes, gang setting works for marten. Get them free swinging in the air so others don't bite them. Good luck. Holler back if you have questions.

Use an attractor too. Duck wing, compact disc, canning jar lids. Keep the lure off the box, keep in on the wings, so bears don't tear up the tree or box.

Martens are a pretty hardy animal , I wouldn’t use 110’s, 120’s are just more humane for the animal. Any more I’m seeing all sorts of people out and about where you didn’t use too.

wws

Ditch the 110's. You will find live marten. Do yourself a favor and only cry once. Buy 120 Belisle traps and make boxes for them.
I have had great success with Gusto for marten. As for bait, I like beaver meat, and duck and grouse carcasses, (after breasting, of course), are also tops.
Good luck, and seriously, sell the 110's, or use them for rats.

Checking in the dark is fine. It's only light out in Alaska for 4 hours, so we are always in the dark. Reflective tape is good to attract them as well as you finding your set. Tinsel will work, use it.

Your lure should work fine. Plastic, wood, cardboard, pipes, Donahue sets (metal dome over a conibear), running poles, doesn't matter. I am not a fan of drain tiles for Marten, but maybe it will work good for you in your area. Might as well try. Chicken wire stapled to a piece of plywood will work. Thread pine tree through the holes to keep snow off. Use big baits if possible.

1/4 mile at most if in good marten country. 5 sets in 3 miles means you are missing many marten. Use big baits if possible.

Set your bear areas that you had the camera on. Elevate your sets, lure on tree or attractor so you can pull it at end of season. Yes set it, you already know there are marten there, forget the bears.

Find the water even if it's a seep in the rocks, set near that. Set any water you can find, both sides if possible. One tree in the middle of nowhere? Set that tree for sure! Set heavy in the dark spruce. Birch are okay, but Pine or Spruce thickets are better hunting and that is where you will find Mr. Marten.

Add jelly to your bait. Yes, jam like on your PB&J sandwich. If there are berries near your box, throw the berries in the box. Strawberry, Raspberry, Grape, whatever. Put jam just past the trap in front of the beef scraps. Give them something they know they like. Not many beef scraps laying around in trees usually. Fish heads work if you can use them. Free from the butcher if legal, not sure for you. Good luck.

I'd forget any pole type sets in heavy snow country (Idaho), you will be very frustrated. Take AK Vikings suggestions.

If you pre-bait for a week, then definitely set two traps per location. Pre-baiting is very effective for marten, you will take off the cream in two checks, then move on.
By pre-baiting I don't mean baiting the boxes, use half a beaver carcass. And take some cat traps along with you to set baits that are being hit by cats.

DT, I can see if your hanging them they will not be alive. If they can get on something I have found them with the chains rattling.

wws