I've said this in many threads, but might as well repeat it. There is no point in dissolving M5AA. Just get a small (SMALL) spoon, and draw out a packed flat spoonful by 'wiping' against the side of the container. ... Dump ten loads onto a reasonably accurate scale (0.01g/10mg) and divide by ten. Voila, said spoon = (x)mg.
As for the need for PCT after M5AA, I am curious about how suppressive it is. I would think it is not very suppressive at all, unless there is some feedback to the HPTA from DHT related substances. Does anyone know?