I am very skeptical of your test results--there's no test that I know of that can distinguish 8 ppm of CYA, and I very much suspect that your TA and chlorine numbers are wrong. I highly encourage you to get your own drop-based test kit and do your own testing. The Taylor K-2006 is so far the best one we've found, and you can use the link in my signature to get it at the cheapest price we've found it from so far (make sure Amato is the seller--if there's a different seller, don't order because some of the suppliers are substituting the K-2005, which is not the same kit).

In a vinyl pool, the hardness increaser is just about useless, except to make lots of money for the pool store. Pass on that. Also, the alkalinity increaser is the same thing as baking soda, but at multiple times the price. If you decide to raise your alk, use baking soda but please double check that number before you do so. I'm with AnnaK, I'm not willing to add 56 pounds of ANYTHING to my pool, so definitely check that number before you do anything.

If you feel you need to keep on good terms with your pool store, you can get the stabilizer there--but check the owner's manual on your SWCG and make sure what the recommended CYA level is.

Janet