You need more borax! Quick! Keep slapping in a box at a time until you see the pH move. Give about 4 hours of circulation time to get it evenly distributed.

Also, your math does not make sense. FC + CC = TC. You simply can not have FC = 13 and TC = 5. I think what is happening here is that you are getting the FC & CC from the DPD-FAS test, and then you are testing for TC again with the OTO test, which is topped out by your high FC level. If you use the DPD-FAS, you don't need to use the OTO test.

Since you are showing CC of 0, there's no need to keep the shock up for that purpose. When the algae goes from green to brown/gone you can let up on the bleach.

As for how much bleach to use, well, you use enough to keep your pool algae-free. Take a look here: http://www.poolforum.com/pf2/showthread.php?t=365 for the table to help you with this. For your CYA levels, it looks to be about 8 PPM.

There are 2 primary reasons to shock:

1. Algae
2. CC of 1+

Of course there are other reasons, (dead critters in the pool, fecal matter, etc) but those are the main ones. If you don't have a problem with the above, save your money and don't shock. I haven't shocked in close to a year now.

Michael