Ok, something I am confused about, for FC you took 10ml sample in test cylinder, added 1 scoop of R-0780 ( I think Taylor Kit does not use scoop, if so add what Taylor tells you to add of R-0870 powder but if your directions are for 25 ml you cut the addition in half. Saves reagent) to cylinder and mix it. The solution turned pink, added 1 drop at a time while swirling of R-0871 and by the time you hit drop 19 the solution turned totally clear. This is FC test and yes your FC= 9.5 ppm. Now you added 5 drops of R-0003, if your solution stays clear your CC are 0 if it turns pink (even a slight shade of pink), you add 1 drop at a time R0871 again counting the drops, if it turns clear on 1 drop it is CC=.5 so I believe your cc are not zero but .5.
I think the drastic increase is due to circulation. The chlorine did not get mixed well when you added last night, then tested. 2 gallons of 10% added to 26000 gal pool (I believe you may have over estimated the gals of your pool a bit, but no big deal now) would be pretty close to that. We will not add any more today until you test tonight, as soon as you get home tonight, turn on robot, brush quickly (doesn't have to be long and real good, just trying to get water mixed a bit) test CYA in best sun possible, and then test all others and brush well if you still have energy. Also are you going to get some calcium chloride to add to the pool to bring up CH. I think it would be a good idea to do sooner rather than later. Can get it a wallmart or similar box store and can do it after getting CYA test done if you have the energy. I must say doing all this while working a full time job, caring for a 3 year old and running the other chores of the house can be very overwhelming.
Also you have mentioned that pool guy tests water, may want to call and ask him what his tests reveal and what kit he uses to test, many times pool maintenance companies test with the Taylor K-2006 write down what he says and what kits he uses and post, it may be helpful depending on what he uses. Also is your Kit the K-2006 or K-2006C? The only difference is the amount of reagent from what I understand.
I know I just hit you with a lot, do what you can, and you are doing OK, for all you have been through the pool does not look that bad. We just need to get it better. So you can teach your son how to swim.
PS at FC= 10 ph becomes unreliable so that may be the increase in PH from last night, will test tonight, FC will probably be down by 3-4 ppms or more.