If you are not having any particular problems, adding enough chlorine 1x per week, to take you up to the Best Guess shock level, certainly provides some safety factor.
Also, if you were using the 0.2 ppm / drop dilution of the DPD-FAS test, then 0.5 CC is a bit high, in which case a shock dose would be appropriate now. BTW, you do NOT have to stop swimming when you shock, except to give the chlorine time to mix.
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