I'm partial to 165-168gr over 150gr in .30 cals IF the rifle shoots them well. The Federal premium 165gr SPBT groups very well in my .308 and is my go to for that rifle. I have a Win M70 .30-06 that only shoots 150s well, so in that rifle I shoot Hornady 150s. I would start with the 165gr and 168gr rounds you listed, and if one shoots 1.5" or less at 100 yards, good to go. If they both shoot well, go with the one that shoots tighter. If you cant get good groups with either, try a 150 and 180. Find a medium game loading the gun shoots well, and stick with that.
I'd also be sure to clean the bolt assembly real well, and consider polishing the feed ramp.