If your numbers are as you state and you have a CC of 1, then you should bring your FC up to SHOCK levels (depending on your CYA level...see Ben's Best Buess Chart - http://www.poolforum.com/pf2/showthread.php?t=365 ) to get rid of the CC.

But your math is correct. TC=FC+CC You don't want your CC to get to 1 or higher. If it does then bring your FC up to "shock" levels, which should get rid of the CC.