If you look through this document on APVMA (Australian equivalent to the EPA) guidelines for pool and spa sanitation and look at our own suggested level there are many similarities.
http://www.comlaw.gov.au/ComLaw/Legisla ... L03960.pdf
For example TA as low as 60 ppm is considered ok and their FC recommendations do seem to take some of the effect of CYA into consideration (but don't go as far as needed, IMHO.
Interestinly, biguanide products like Baquacil are not registered (but they have registered a very few hydrogen peroxide products and the beloved Nature 2 and Flotron are not allowed unless FC levels are at a minimum of 2 ppm! (not in this document but I just spent a few hours going through their website!
It is also interesting that they do not provide maximum FC levels but do have minimum requirements of 2 ppm in unstablized pools and 3 ppm in stabilized pool when the temperature is over 78.8 degrees F (26 C).
If only our own EPA was a diligent!