Hi All
well we have a few growers in Spain who use CM clones and consistently receive 700 grams per 600 watt lamp...and after 4 years doing it and honing their skills with this selected CM it is achieved in 8 weeks flowering time from day one of 12/12...by using a pre grow room.
The thing is to select for the traits you are aiming to achieve with a plant.It does not occur obviously with every seed of CM.
Usually selecting only for high yielders means some other trait will be lacking in the final product so better to look for the plant that you enjoy all effects from and has a good yield imo.
Quite some growers of CM experienced male flowers in lower branches until they work out this plant is sensitive to light intensity and good EC. So my advice with CM is to grow it as a sog with only main colas and no lower branches, this will ensure good air circulation as well as reduce any issues due to light lower down on the undergrowth...not to mention reduce manicuring time. It can feed as high as 2.5 ec which is the most extreme girl in our camp when it comes to feeding.
All the best sb