If the schedule says to stop using it, then I'd stop using it. See how the plant performs without it.QUESTION.... What does everybody do about root rot in coco? And should you just keep an enzyme going during flower? I know the calculator says stop in week four.
However, if you have root rot, the plant may be unrecoverable at that point.
A quick google search turned up this
http://www.gardeningknowhow.com/problems/treating-root-rot-gardening-tips-for-housplants.htm