Soaked seeds overnight in de-chlorinated water, then for about 48 hours in a damp paper towel. All had radicle emergence, and one of the GSC had cotyledons and had already dropped the seed coat.
I put them all in soaked rockwool cubes surrounded by hydroton, each in a 3.5gal DWC bucket with an airstone. Light set at 50% at ~20 inches.
hang in there. For the most part, these are pretty forgiving plants. After all, it is a weed. I screw up my pH all the time, so I feel ya.
Peace and may your GSC develop some StinkyBudz!