I think that you have it backwards, the .308 had a standard 1:12 in the past. That is why most .308's couldn't shoot bullets heavier than 180's. For that reason, company's are starting to offer 1:10. I don't think that you can "overstabilize" a bullet. I'd go with a 1:10 if I had a choice and have a wider range of projectiles that my gun could shoot.
That is correct, it was backwards & yes 1-10 twists are coming out more & more because some into shooting in the longer ranges are wanting to shoot the heavier, higher BC bullets. But all of that doesn't matter if you have allready decided that your bullet of choice is a 168gr, the 1-10, 1-11.25 & 1-10 will all work. The quality of bedding, quality of receiver & esp. the quality of the barrel will come into play more than which of these 3 twists you get. For what it's worth the 165-168 bullets is what the companies were thinking about when they settled on the 1-12.
Like Jim, I would rather have the 1-10 & be able to shoot the 185 Berger & others to optimal accuracy, but that is not an issue with your question.