If you have another stocking, go on and put the next lb in. No need to be slow about it. It will take a while for it go be effective so do it all now. Squeeze the sock from time to time to get it going too, just don't let solids escape if you can help it.
You are good for now, pH is in range, FC is somewhere above 5, CYA will be on its way to 30 when you get another sock or bit of pantyhose in the pool with the next lb.
You never answered the question about what the water looked like. Is it clear or cloudy or green or grey or white or what??? Is there any silty stuff on the floor of the pool, any color to that if there is any? Is the side of the pool slimy? Three days with no chlorine may not be growing much algae or maybe it is.
Probably is slimy on the sides and floor so brush it well. When you brush, chlorine will probably go down some as you are killing off some organics that are just starting.
If the water is clear, no color or clouds, and nothing on the floor that looks like algae, then it may be that nothing is alive in there. Be sure by doing an overnight chlorine decline test. Start at shock level for FC, be sure it is all circulated so you know what it was. Test FC before you go to bed, add and test until you know it is where you need to be. Then early in the morning test again before the sun hits the pool.
You want to see that in the dark the FC does not drop more than 1.0 ppm from whatever it actually was when what you added last was all circulated. With the sun gone, only organics will use up the chlorine.
When the pool passes that test, maybe tonight, maybe in a few nights, then you go on to the next part. That is; is CC < 0.5? [edit] If so, then, if the water is clear, then you are done shocking. There may be some cloudiness that needs to be cleared by the filter, but some white is OK. You will keep the FC at the top of the normal range for your CYA until it is clear and sparkling. All this time the filter is running 24/7 to clear the water.
I think you ought to test the FC before you go to bed.
