might knock the reply counter up with this one because I reckon not many people have got the minerals!
Ive done it and took out the center stems at least 18" on three main stems we are talking white widow plants 4 weeks into flowering
Ive only done one plant though in case it dies , The alternative is that the chopped plant will grow extra big side shoots to compensate. I expect the plants to suffer a bit and flowering may take a bit longer. We will see