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I cannot comment from personal experience on the difference in results between 9" and slower twist barrels and all bullets, but I do know of a 6BR with a 14" twist barrel that shoots the Nosler 55s and 70s in the mid-.2s consistently. These bullets are certainly adequately stabilized with the 14" twist.
Most accuracy experts agree that spinning a bullet faster than required for stabilization can hurt accuracy, particularly at long range where the over-stabilization keeps the bullet's axis from following its flight path. The result is increased drag and a much lower BC. Benchrest shooters usually use around a 14" twist rate for the 68-70 grain bullets they shoot in their 6PPCs.
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