in Texas we've started putting up hog wire fence around our deer feeders.
deer jump in, hogs stay out. run 2 strands of barbwire low and real tight.
if you saw 10 rest assured theres 30 you didn't see.
make the entrance to your trap no higher than 2 foot. that's all it needs to be...
yes, even for a big one. they can crawl under a hole in a fence lower than that.
if you ain't careful you'll catch a deer in it.
put a thorny limb across the entrance about 2 feet high that will deter the deer.
bait it with sour corn will help too.
best of luck to you.