Hi Digger,
I would wait to change out the sand for just a bit longer. You can go ahead and hang a sock of cyanuric acid if you want. It is goint to take about 6 lbs. in total to get you to a reading of about 30. That is a lot to put in a sock. Maybe divide it and hang two socks or do one sock with 3 lbs. and when it dissolves do it again with 3 more lbs. If you will give the sock a squeeze once in awhile, it seems to dissolve faster.

Did you get a tracking number to follow your kit and if so, any estimate on when they expect to deliver it to you? I would suggest continuing to continue testing and adding the bleach like you have been for another day or two and hopefully, by then your new kit will arrive and we can get a good set of numbers. And, then, if all looks good, it will be time to change out the sand and you will officially be past this conversion. To answer your question --- yes, it matters what your readings are. Even when water looks crystal clear, sometimes something is going on that you just can't see. The overnight chlorine loss is a good indicator that something is brewing so that is why we need to know that.

Almost there!! Hope this helps.