If you are going to continue with trichlor then your TA (ALK) of 150 is on the high side of OK. However, you will very soon run into problems with an oversabilized pool. I would suggest ditching the tabs and dosing with bleach every evening.
Also, there are cheaper alternatives to pool store calcium if you don't mind buying a 50 lb bag of calcium chloride (usually sold either for deicing or as a concrete additive). Look for the Tetra brand. It's a bit purer than the Dow brand.