I always cringe when I read something like this. Auto's, just like photo have varying THC levels. Most breeders test and tell you what % of thc is in any given strain. So Pick the THC% you want. You're making it sound like the ruderalis is depriving you of massive amounts of THC. If the auto strain being offered is 25% THC are you just going to dwell on the fact that it could have been 26% ? Just pick another auto strain than thats 26%.
As far as light schedule goes I don't think there is any one right answer. I know your big on how Mephisto does it but I don't believe it tells the whole story. You need to factor in DLI. So depending on your set up it it may or may not be better to push you plants 24/0 depending on multiple variables including your light intensity and how far you can back your lights off, temps, CO2 and humidity control. I would argue that if you are going over your max DLI you would be better off running 18/6 or what ever.
I could be wrong, but I suspect
@Oldreefer is maybe running some old school 1000w hps and dumping a ton of light on his auto's running 12/12.