It can be difficult to judge in such a large pot, that is why I suggested you planted into a starter pot which is much easier to manage by watering from the bottom and letting the coco draw the perfect amount of moisture up
But you didn't do that, so we have to work with what you have
What you've done looks ok though, judging by the colours of the coco
Coco is hard to over-water because it is loose, airy and free-draining
That means you could repeat this routine every day and it wouldn't cause any problems
Next week is exact same process, but 2ml Part A and 2ml Part B