OK so this morning I had a chance to do a full test, here are my numbers:
CYA = 65 (did this twice and got the same value so pretty confident on this one)
CH = 490
FC = 32! (used 5ml diluted with another 5ml of tap water as zea3 suggested) and 32 drops later it turned clear so 32 x 0.5 x 2 = 32...