Ultra Fair Shipping Charges-Yet Rated Low on Star Syste

I Sell fishing lures and generally charge $1-$1.50 for up to five lures. I do not charge handling costs. I do not charge for Delivery Confirmation when I use it. In spite of all that I continue to be rated at less than the full 5 Stars on okays new Seller Rating System. I firmly believe that I could ship my items FREE and still get less than 5 Stars. I do not understand the mentality of Buyers who can't see the bargain I am giving them on shipping. I also ship 6 days a week and sometimes TWICE each day. My Shipping Stars for delivery timeare also less than a full 5! I am not looking to make the "Honor Roll" but something is wrong with this new 5 Star system