My Acc arrows are 28.5" and are the 360's. In an earlier question I was told to switch from vanes to feathers to reduce the spine, since I believe these are too stiff for my setup. How much weight will this shave off my arrows? & If I go to 85gr fixed broadheads from 100 gr. how will this change the spine? Will the combination feathers and lower broadhead weight change my spine much? I'm thinking I should go to 125gr tips but I'm already heavier than I want to be, let alone adding more weight. What do you think? Thanks