I'm with Latt on the Roundup. I think your black tarp will work well if the area gets direct sun to really heat the ground under the plastic. You might also see some reduced disease pathogens similar to steaming or fumigation used by commercial growers. I am doubtful, however, that it will work as well in the woods.
I think the key to wild simulated is to plant sparringly and at the right depth. I have not had good luck with this using the rake and scatter methods. Like Guy said in the other thread, you can't really control your planting depth with the rake and scatter methods, and this in turn might lead to reduced or delayed germination (whatever the mechanism).
Here is a picture of the wild sim patch I was telling you all about before...
As far as I can count in the fully blown up picture, there are over 60 wild sim plants visible here. I know I planted a few more than are there, however. So, like Latt says, some just won't make it.
I think if you plant your seed sparringly, and then go back a couple years later and reseed some of the bare spots, not only will your plant numbers increase, but your age classes will be varied and more consistent with a truly wild patch of seng.
The plants in the picture have never been sprayed and were planted with my tool (ECF Seeder). I think there is something about disturbing the ground that we have yet to connect. But, I\"m suspecting there is a definate connection with tilling and disease. That is why like Latt, I recommend tilling beds (at least for now), then spraying for a few years.