With a cya of 35 and that fact that you currently have no chlorine in your pool, you should probably shock it up to 15. In a pool this size each 3 qt jug of will raise your cl by about 2ppm. You should add it in the evening and then see how much it drops by morning. If you are losing more than 1 ppm overnight, then you are fighting something in your water and you should add enough bleach to get the cl back up to 15. Test and dose it with bleach two or three times a day until you get to the point where you are not losing more than 1 ppm of cl overnight. Then, you can let the cl drift down and keep it in the 3-6ppm range all the time. If you let it dip below 3ppm, you are inviting an algae bloom.

Also, your pH is ok at 7.2 but just watch that it doesn't drop any lower. You can use 20 Mule Team Borax (in the laundry aisle at Walmart) to raise it.

Hope this helps.

BTW -- Don't use soda ash. It will raise your pH and your alk and you don't want your alk any higher. It is great at 100.