EDIT (the day after)
I have a feeling I was able to do the super pruning just in time before the actual flowering. Just in time to give the lower branches a breather, let them catch up on their development compared to the higher ones, and while they recover from this other dose of stress, let them concentrate on the areas with flowers.
Yesterday, after cleaning up, I waited a few hours (I made the cuts at the beginning of the 12 hours of light) to give them a nice liter and a half of fertilized water - I overdosed them with BioGrow (5ml in 1.5lt).
Today the plant looks nice and fresh with nice colors and it seems that the lower leaves have already started to work again to replace all the wood cut yesterday. According to the principles of applied work the buds should enjoy it. In quality and size.
Let's hope again, in the meantime it doesn't look injured.