cruff10,
In my opinion, there is no difference in seed as far as what kind of root it will produce. If you till the ground it will grow different than if you just plant it wild simulated. The thing I would worry about with artificial shade grown seed is bringing in disease. I have planted seed from several places and have had good results with all of them, but prefer seed from places that grow ginseng in the woods.
If you dont have a copy of Scott Persons book, you should buy it. The book covers just about everything. Scott is also a great person to buy seeds from.
As for the roots growing in your woods being small, it is probably because of too much shade and/or not enough calcium.
Good luck with growing ginseng, it is a lot of hard work sometimes but is also a lot of fun.
Lenno