One thing that will speed things up some would be adding CO2. I've had it take almost a week off my flowering time. I didn't use it for that reason though. Using CO2 will give you a larger yield and allow your optimal temperature to be higher than 72 degrees allowing you to get your light closer raising the intensity of light hitting the plants and increasing photosynthesis which the CO2 aids in doing. If you don't have an air cooled hood and an air tight room then forget about it. You would be using too much CO2 to maintain proper ppm's and it will be a waste of money.
I also read in one of Rosenthal's books that you can do 14 on, 10 off. I always go with 12/12 though for flower and 24 for veg. You can save some time on your grow by doing 24/0 on veg. A lot of people say you should do 18/6 but I've done both and see no downside to 24/0, only faster growth during veg from the extra 6 hours of light per day. Look at my grow journal and you can see how fast my seedlings grew over the first couple weeks.