Badlander, the Barnes bullets can be pretty finicky when it comes to accuracy loads. Most of them don't like twist rates slower than 1:10 and you need to start out with a VERY clean barrel. They like to be pushed hard.
I was told by Barnes that they have very few bullets that will stabilize with a slower than 1:10. I was hoping to use the Varmint Grenades in my .223 but the 1:12 twist is said to not stabilize them.
My '06 has a 1:10 twist and it loves the 165 and 168 gr TSX better than the older coated XLCs (which also shot very well).
If your rifle has a twist rate slower than 1:10, you may be out of luck for using the TSX or TTSX. That could be the problem you are facing.
Best of luck. I have found they are great bullets and perform as flawlessly as anything out there. Others have had very poor results with them.