If you are growing indoors, what I have noticed is that when I make my switch into flowering, I do not gradually reduce the light schedule. I just make the switch straight to 12/12. For the indica doms this has proven ( for me) to really stop any stretching or keep it to a bare minimum. Sometimes, some genetics will be a tad stunned, but this will also stop the stretch factor as well. I hope I was able to help out some.
Peace, Love, and Happiness