Sorry if I'm repeating this. I didn't read thru all the posts, but don't forget the use of the wing and scratching. If you get a tough tom two of the easiest things I've found to seal the deal is a wing to mimic a fly down to a roosted bird or simply some scraping against brush, etc., and scratching in the leaves. Not to be too long-winded, but I've had two birds literally in my lap using only these "calls." Unfortunately, both were successful hunts, but taken with modern shotguns...I'm still looking for one of those situations to pop up with the flinter in hand where I feel 25 yards and under is my ethical range.
An old timer taught me to use the wing for my scratching in conjunction with purring. He was certainly right.