How far into flowering does the G13 Haze stop stretching?

I am three weeks into flowering with a 10-12 weeks sativa dominant g13 haze barneys farm. it has already grown 60 cm and thats with a lot of supercropping and tying down branches (7 weeks veg) now three weeks into flowering i have stoppped bending down the branches and they have started to grow upwards now. i only have 1 metre space for them the other 60 cm i have is for the light and i feet away at least 400w hps. DOES ANYONE KNOW IF IT WILL STOP AT 90CM-100CM AS BARNEYS ADVETISES OR IF IT WILL STRETCH TALLER AND BIGGER BECAUSE I VEGGED FOR SO LONG?

I only vegged my Barney's G13 until my clones sprouted 1 new set of leaves before I stuck them in flowering room. Because they were so small I thought I might put 2 plants in each 4 gallon pot. Now 6 weeks into flowering they are 6 feet tall, my light is all the way to the top of the chain. They have 100's of bud sites, but they are all taking wayyyyyyy to long to form any bulk. I have Jackey White growing alongside (1 month older to the day). They are only 20 inches tall MAX and have a week or 2 to finish. I started flushing yesterday.