Good luck with this im sure youl do fine, i agree with mixing the soils, unless youv tested it out already, why not do a paralel test this year and stick one in the ground and see what you get..
I grew auto mazar last season, they all eaten by ants but 2 pulled through, really bad season also not much sunshine. The smoke is really good and has pain relief too, its one of the best tasting autos ive tried like a creamy indica .
I grew mine at lat 52 and im growing them again this year, check out my grows from last 2 seasons via my profile, sorry cant paste links at this time.