I think that the drippers on 24 7 or almost constently are better, but you can't use RW as the medium because it would become to moist and cause you problems. Biggest thing when using a drip system with RW is to get good drip timing down, it can make all of the difference.
If you want the dripper on almost full time then you will need to put your plants/clones right into hydro ton, or clay pellots or Lava rock. They do not keep alot of moisture so you can run your drippers almost all of the time.
I will get back to you with some basic RW drip scheduals and Hydro ton/clay pellot times as well.
Adieu