As for your questions:
Setup is a 6x3 flood tray with 3 gallon pots. There is 1800 watts of HPS supplied to the tray by three 600 watt bulbs.
The plants are grown in coco and fed with a DIY top feed drip system. The drip system is built using 3/4" schedule 40 PVC to 1/2" drip line to 1/4" drip tubing to make the rings. I do not use emitters, I use 1/4" T's as my emitters (they never clog). There are 3 risers built out of the 3/4" pvc, one for each row of plants, off of those risers runs the 1/2" drip line down each row. Then, 1/4" line connects to the drip line at each plant site. I then took more 1/4" line to build the rings and connected it all together with the 1/4" T's as the emitters. There are four 1/4" T's dripping on each plant.
The drip system is run from a 30 Gallon res with a 1585GPH Mondi sump pump. I'm usually only using 10 - 15 gallons per feeding and the pump and drip system dumps that into the pots in about 1.5 minutes.
I run drain to waste, although you could recirc it if you had proper filtration to keep the solids out. I tend to not like recirc with coco because you want to get any buildups out of the medium...recircing just keeps them in.
As for why I think Chocolate Rain is a keeper...because she yields great (84+ grams per plant in this setup), she has a wonderful, earthy, faint chocolate, kinda sweet taste that I can't get enough of. I find myself with my nose stuck in jar for extended periods of time..lol. The high is great, to me...it's strong, uplifting, happy and energetic. My wife and I find ourselves laughing as we are getting shit done around the house after smoking CR. There are not too many strains that make me feel like I'm a kid again...getting the giggles, etc...Chocolate Rain does that to me. I prefer it over my heavy hitting Indicas (unless I want to veg on the couch..lol).
Hope that helps, sorry for such a long delay in responding. I'm not subbed to this thread and missed your post. Feel free to PM me if you have additional questions about my setup.