It would really help if you had the good Taylor K-2006 kit because your readings would be much more reliable and your chlorine test could read higher than 5ppm. Plus, it would help us to know your CC reading.

An OTO kit can only read chlorine levels to 5ppm so your chlorine may be higher than 5. 5 is not shock level for any pool. You can force your kit to read higher by using a dilution method described here: Testing Without a Good Kit

What kind of liquid shock are you using. (What percentage sodium hypochlorite is it?)