Stability dose not guarantee accuracy and poor accuracy is generally not a stability problem. More likely something else going on there. 1-9.5 is fine for the 162 amax and has worked well in the 2 t3 7mm08s Iv done (though not with 2208, I think Id try a slower powder) 1-10 twist works well in my 280ai at slowish velocities. Berger recommend 1-10 for their 168gr vld which is heavier and slightly longer.
The 140 vld Iv had success with 2208 in the low -mid 40gr and 2209 in the upper 40's.
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