I was working on a CBD/THC cross here myself, but I got into it with hemp seed suppliers that refused to sell me seeds knowing that I was crossing them with "marijuana" (oh my gawd! Not Mary Juana!). I decided that there was no point in trying to re-invent the wheel, so I searched for some landraces that already have high CBD to THC ratios, and located two sources of Lebanese landrace strain seeds originating from the Bekaa Valley area (RSC in the UK and Blue Hemp in Switzerland). I obtained several through friends in Europe and grew them here this year, and whallah! Far better then expected results. They make this weed into hashish in Lebanon, but the buds taste just fine as they are. Lemon and floral notes. They are also low odor growing outside. Also the high is mellow and... drumroll Anton.... it reduces my migraine headaches, and aborts the milder ones completely. No couch lock or narco sleepy result. Day weed. The seeds resulted in two phenos, as advertised, a sativa and an indica. They are both similar in high, but the sativa matured a month earlier than the indica phenos (great for avoiding early September rains in Oregon). I made two crosses, a sativa male with one sativa female and one indica female. Seed production was very good.
BTW, I have tried a dozen or so CBD only and another half dozen CBD/THC crosses, and none of them come near the results of landrace Lebanese on migraines. For pain, yes, for migraines, no. I have severe back and neck pain, and I get migraines.