I usually stay away from 2-hens-and-a-jake because everybody does it and it doesn't take long for the toms to be wary of any arrangement. Early in the season I might set a jake with a hen, but separate them by 5 or 10 yards, having the jake be the first decoy the tom sees or encounters. If I use just a hen, I'll set her up so the tom has to come past me to get to her and make her a little hard to find. I've found that if she's visible from a long way off, many times the tom will hang up expecting her to come to him. Late in the season, when the leaves have popped out, I don't use a decoy. The birds are in range by the time they see the decoy anyway.
There is no substitute for scouting. Not only do you have to know where the birds are, you have to know the landscape. You need to know the travel routes the birds will use to get to you and any obstacles such as fencelines or ditches that will hang them up. The gobbling in the morning will tell you their location.