Glad to hear that you are making progress.
To know when you have passed the overnight test, you need two numbers to compare. In the evening, add enough bleach to get to shock level. An hour or so later, retest the chlorine and make note of the reading. The next morning within an hour of sunrise, test the chlorine again and compare it to the reading from the night before. (The reason for wanting to get a morning reading before there is much sun on the pool is because sunlight will also drop the chlorine. Chlorine loss overnight when there is no sun is strictly from oxidizing stuff in the water. You need to be able to tell how much chlorine was used sanitizing without loss to the sun being a factor. Does that make sense?)
So, shock it again tonight and compare numbers in the morning and then post with results. Sounds like you are on the right track!
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