My wife shoots 130TTSX or 165 Accubonds. I'm with you on not shooting 168 coppers. I would shoot 150gr maxWhy are you shooting 165gr coppers out of a .308?
You need to drop weight to run them faster. A 150 would be a better choice, I shoot 130’s out to 400 and my fiancé killed 2 elk at 350yds this past fall with that load.