Why CYA level does your SWCG manual recommend? You should be there. Frequently, it seems to be higher than 60ppm, more like 80ppm.
Next, the best guess table has that level of FC for CYA of 100 or more, not for CYA of 60, and those are level for NON-SWCG pools.
Unless you have an algae problem you should probably be letting your SWCG make your chlorine and keep it at the 3-5 level or lower. Here the SWCG experts will hopefully chime in and give you the exact level--it may be even lower. The reason is that a properly functioning SWCG keeps a very consistent chlorine level in the pool.

Carl