Since you have CC, It wouldn't be a bad idea to bring the FC up to shock level. You don't need Calcium in a vinyl pool, but since your calcium hardness is low, you do have the option of using Calcium hypochlorite to chlorinate and/or shock. The Alkalinity isn't too bad, but if you want to bring it up a little a few pounds of baking soda is the ticket. At that level of CYA, you'll want to maintain a FC level closer to 5-10 ppm. If your pH starts to drift up after the baking soda is added, some Muratic acid will bring it back down nicely.