Guybrush3,
Just to throw in my 2 cents, this is not recommendation just food for thought. If it were me in your shoes I would con't to follow cj3737's advice, while I see she is new to the site she really seems to comprehend the method and does a thorough job trying to explain without writing a book which has already been written but send good links. Hopefully you have read Pool school several times and are starting to follow the logic. Kcindk also has good insight, but because of the CYA reported as zero then as high as 95 and now 70-80, I am pretty sure there is some error in testing. I actually ordered a reference solution of 50 ppm from TFtestkit so I would know what the positive test looked like at a given level. So since I am not certain that your CYA is accurate even now, I would hold off til at least the weekend for 2 reasons: 1) you are working and will not have the time to spend draining and refilling and when you test again I am not sure about reliability in testing of CYA. 2) since you are working stay with Slam as recommended by cj3737 and lets see what happens at the new FC slam numbers, may give more insight as to which CYA you are at. And when you do have time really work on getting the stuff off the bottom and out of pool, it will shorten your time to seeing the water change from green to more blue and may be the biggest reason you are moving a little slow, but you also haven't been slamming long and some mistakes along the way. Also do you have well water that you will fill the pool with or city water, it will make a difference in some decisions in the future but good to know now.