4’x4’ - 2x600w HID - First Grow

Has anybody had experience with using co2 and how it affects harvest time? I’ve just gone into week 8, and going by the trichome clear/cloudy rule, they are ready to harvest. Mostly cloudy, some clear. I have read once they ripen to a point the thc is reduced as the cbn increases, giving them more of a couch lock effect. I hate couch lock. I know some who prefer it, but it’s definitely not for me. Should I harvest 1 bud to dry and cure, then another in a couple of days, then the rest in a week and compare in a month or two when it’s ready? Or has the co2 accelerated the ripening that much that they’re ready now? Tough question I know, but I’d rather harvest lower quality early than have a heap of couch lock bud.