I would try to ambush him as well. Especially if you know where hes going. How aggressive do you get with him? Also can you set up by moving around him while hes on the roost? Sometimes just making a different set up helps especially if you think he has you patterned. Mix it up try different calls to him. Change your pitch on your calls especially if your using a mouth call. Start of soft , get louder then end softly. If the turkeys are few and far between use some lost hen yelps. Dont be afraid to kekee and go into yelps as well.