If you're shooting accurately, and with that much punch, the way it's set up now, why would you want to change anything? Sounds to me like things are working well together. I think as much as you shoot that you'll be used to it enough that the cold won't really make a difference for you. I would just stick with what you have now and save your money for something else. Just my opinion tho. Good luck with whatever you decide
I think I'm going to leave it as is. Maybe take it back to 68lb if i do anything. That's only upping it 5lb. I feel it will be fine. I can draw 68lb all day in the stand. I shot 70lb at 30 degrees last season and was fine shooting 60lb. I just want that little extra speed, momentum and added KE. Right now it's shooting 280 exactly which is plenty fast.