The rule about the pH test falsely reading high when the FC is high is actually more of a problem when there is no CYA in the water. With CYA in the water (at usual FC/CYA ratios), the reaction of chlorine with the pH dye is slow enough that if you take your reading right away you should get a correct result. If you wait 30 seconds or a minute or more, then you may see the effect of chlorine reacting with the pH reagent to create a falsely high reading. The pH indicator dye reagent contains some chlorine neutralizers, but chlorine levels beyond that can react with the dye but with CYA in the water they do so over minutes, not seconds.

So your pH may indeed be at 8.0 since adding chlorine to raise the FC does raise the pH (it only drops back down when the FC drops back down). Unless you have metals in the water, having the pH be at 8.0 is not a problem, but your pH test may not read much higher than that so you are probably better off lowering the pH a touch down to 7.8 where it may still be reasonably stable.