Welcome to wonderful world of hydro. I am new to the forum but have been growing the greens for years. You say you used swag seeds? From my experience it is about a 90/10 split on how good the end results will be. 90% is how you grow it and 10% is the genetics of the plant. Any marry Jane seed even some nasty swag can make one fine end product if you give it the right attention. When they grow the nasty seedy stuff the seeds are just tossed in a field and left to grow. No one sexes them and kills the males or gives them any love at all. Really the best stuff I ever grew came from some back yard boogy woogy and it come was the bomb when it was done. The 2 plants got about 8' tall and I got about 40 oz of finished product. I have gone from soil to hydro many times and some things that really helped my plants for stress are to use Dyna-Gro Pro-Tekt in the water and Higromite for the medium. Also as stated make sure to rinse the roots off and remove an soil also be very careful not to hurt the roots, the more ripped roots the more shock. Some hydrogen peroxide can also help keep the roots happy after moving from soil but be very careful as it can cause chemical burns if handled incorrectly. I have found starting seeds in Jiffy Peat Plugs or Oasis Rootcubes to work better than rockwool then transplanting to 4? rockwool cubes after the root start to pop out of the plugs and then into the hydro system. Good luck and enjoy!