There is a lot of research into this and it always comes back to just do nothing different. Dr. Bruce Bugbee did a huge work up on this and he found there to be no difference in the production of trichomes. So he says that you keep running your lights, keep feeding it and do nothing else. However, he did state that the last week you could defiantly not use nutrients to flush the plant but he still feels like you do not need to even do that.
I do like to flush the last week, and by that I mean I only give straight water. I do not actively try to rinse my soil out.
I hope this helps.