I figured you were using a K2006 when I saw readings in increments of 0.2. Actually, instead of using the 25mL sample, just use 10ml as it will save on your reagents. You'll multiply the drop count by 0.5 instead of 0.2.

The only way to lower calcium is to do a partial drain and refill which doesn't make sense to do if your fill water is also high in calcium. It will be important to keep your pH and TA on the low side, though, so you don't end up with a milky pool. And, definitely no more products that have calcium in them.

Steps for lowering alk can be found here: http://pool9.net/alk-step and also please read this one, too. http://pool9.net/muriatic/

(If you decide to try the alk lowering process, you'll need to raise your pH up before you begin with adding acid.)

(Edit --Actually, I just asked Ben if he thinks you should mess with lowering an alk of 145 in this case or not. Let's see what he thinks.)