Although I can't claim any with my longbow (yet), I've killed lots of gobblers (mostly Easterns but also a half dozen Rios and a couple Merriams) with my flintlock as well as the boring ole' 12 gauge. I've tried every decoy combination/type/style from single hen, feeding hen, jakes, hen/jake full strut jakes and toms, half-strut jakes, 3-5 bird flocks... you name it and I've probably tried it. Turkeys can be funny critters and I'm pretty sure they change their preferences on a minute by minute basis - if you try to get into their head you will lose your mind. Other than full strut decoys, which can be boom or bust, I think a hen and/or jake are almost always a good bet. I have used a single jake and killed birds but I couldn't say it was any better or worse than a single hen or a jake+hen combo.
I do think the ultra realistic decoys, such as the DSD, are worth the extra money, especially when you need to hold birds in close for archery or blackpowder shooting. The last tom I shot with my flinter was in Oklahoma and we had an entire flock milling around and feeding with our DSD hen and jake for at least 10 minutes before the tom came in and presented me with the shot I needed. If the price doesn't scare you off, I would the DSD decoys.
Good luck on the toms. I look forward to gobbler season too because it means nicer days afield - it's -37 with the windchill here today!