If youve done DWC before, you should do fine! DWC rocks and its pretty simple. What brand of nutrients are you using? seems like GH? Just curious. GH is excellent, Canna is great and Advanced Nutrients is very decent.  Are you starting back with fresh bottles of nutrients or are they several years old?  Make sure you shake the bottles before using and remember that less is more also there is an order in which to mix the nutrients.

This, you should already know but im just covering the bases since its been a while