I agree a 60#er would be perfect ,but if your going to crank it to 70# you would most likely need to go withthe 340 series . As it stand's right now ,your right on the line of being too light. The blazer's are a good choice and since I just read your thread over you haven't bought arrow's yet I'm assuming ,so I'd buy the 340's and that way you have the room to crank her up if you want to .And will be right on spine.

nubo