I noticed if I use both types of traps (open cage and PVC) when setting, the skunks will usually be in the open cage trap. I think it is because they see the bait easier.... same reason you have for catching them in "shorter" traps.
I set three traps for skunk last night all within eight feet of each other. A pvc tube trap, a 7x8x24 Safeguard and a 11x12x30 Safeguard all baited with the same cat food and sardines. As has been my experience, this morning the skunk was in the biggest trap.
I really don't know why I do better with the larger traps. I've been thinking it's because it's more open. Not as confined. But I could be way off in that thinking.
I agree with Ron that they will readily go into the pvc and smaller cage traps but it seems if they have a choice they prefer the luxury model.