Bean,

Your issue is simple and should not be a struggle.....You need chlorine.

Chlorine applied in the daytime will be consumed by the Sun...quite rapidly if you get full Sun...hours, in fact.

Chlorine applied in the evening will be consumed by organics in your pool.....and you still have them.

Until your chlorine is virtually stable overnight.....you need more chlorine!!

Don't be side-tracked by peripheral issues because you will be lulled into thinking your issue is something else....it's not. You must calculate your Chlorine dosage carefully. If your shock value is 10 (it is) you will never get to that point (which you must) if you only add enough to get to 8 or 10....it'll be partially consumed before it ever reaches that level.

Carefully calculate enough chlorine to get your ppm to 12ppm....it will then probably make it to 10ppm (breakpoint) freeing up enough chlorine to make some effective headway on the organics in your pool. (that junk on your sidewalls is organic....brush it often and expose it to the chlorine)

Go swimming!! Get the kids some old swimsuits just in case (unlikely) that you experience a little fading.

You may add CYA now if you like. DO NOT think that will help clear your pool but it will help you retain some chlorine during the day.

Synopsis - You need chlorine