I remember seeing CJ3FLYR having the same issues with the SA's. His would balance out great for a while, but after a couple hundred miles they would be out of balance. He switched to some Toyo's I believe and hasn't had a problem since. His suspicions were that the tire was rotating on the rim, which was also alluded to earlier in this post.
Do you notice the problems immediately, or does it take some time before noticing they are out of balance?
It's pretty immediate, but I have had instances where the balance was bearable, but then would get worse after a few weeks. The steering wheel also shakes more when the tires are cold. I had them balanced properly by the dealer once, but as soon as I had them rotated, they were out of balance (without a re-balance).
I'm going to try some Nitto Terra Grapplers soon and I hope that will help the issue. I'm done with Goodyear.