GD -
You didn't mentioned if you had put decoys out or not. I find that early in the season they seem to hurt more than help as the lead hen often takes the group away.
May also need to tweak your calling. Also I like to start off soft and infrequent, then gage the toms response. If one answers from the roost to your "sleepy wake-up" yelp, he has identified you as a real hen and I don't call anymore because toms will sit on there limb waiting for you to appear below him before he flies down ... when you don't show up he usually will smell a rat and go the other way after flydown. The most I will do until he hits the ground is too do a flydown cackle with a hat or wing simulating beating wings. Use his curiousity and sex drive against him. I also have been known to do an occasion gobble call or aggravated purring and hat slapping if nothing else is worling.
Ambushes work too if you've done your scouting and patterning of the birds. But as you know, weather and hunting pressure will change their normal routine or patterns.
Best of luck .... Al