The BD looks beautiful. One of my faves in soil to grow, although I usually end up with a lot of fluff balls at the end from the bottom - still very usable. The GDP will turn purple like that, but I typically notice the change in the latter part of the flowering cycle towards week 6-8. I agree with DST - a bit early to be turning yellow now, but not something I would consider devastating just yet. When planting in pots, you will want to really be on top of your nutrients - the worst thing ever is to deplete the soil reserves and the plant suffers right about when it is starting to produce the good stuff. It takes a lot of energy and nutrients to produce those buds, you might step up the feeding.