Warning - Jake Decoys can make sub-dominant birds stay just OUt of range. I suspect that was your problem.
Your blind is just fine. Good choice.
JAKE DECOYS
I have witnessed sub-dominat Toms (not Jakes) stop just out of range because I have a Jake decoy out close to my hen)(s) -to the point I hardly use a Jake decoy at allOR if I do, it isNEVER placed next to hen(s) but put on the other side a good 20 yards away in the opposite direction. I tyry to make it look like a Woos jake! Not dominant. I have seen other Jakes folwoing hens that when they see that Jake also stay away.
Also move your decoys in closer - 15 to 20 yards is a bit too far. As I said mine are never more than 7 yards out. Ya that seems close but then when the Tom comes in I can see the Whites of his eyes!
STRUTTING DECOYS
I have had great success withfull blown strutting decoys either B-Mobile or Pretty Boyand the struter is placed about 2 ft. behind a full body hen that I have laying right on the ground. I also use one more hen that is palced 8 to 10 yds away from this pair. I do use a real fan to my strutters. Way before Primos or Knigh/Hale came out with their Tom version Iactually turned one of my Carrylite rubber Jakes into a strutter by folding his rubber tail up into the body cavity. Then my mounted fan has its own stake I push in the ground right behind him.
I am still working on my theory that a Jakes center 4 feathers in strut mode is a visual cue to any old Dominant Tom but I don't have the data yet to finalize and share my thoughts.
JW