No such thing as too much light, so keep the cfl as long as heat isn't a factor.
I would highly recommend topping them about 8-12 inches, and holy crap, PLEASE defoliate the bottom third sucker branches! Do this by week two of flower. First three weeks of flower think of as a " super veg" time, as you will see the most stretching and explosive growth. If you do this by week 2-3, your plants will have plenty of time to adjust to the stress.
Do NOT mess with light cycle unless you want to throw a month of time out the window and possibly your genetics too.
Also, what genetics/varieties are you running? Maybe I missed reading them, but if they are from seed, you will need to be able to inspect every plant for Hermes throughout flower. Different genetics will also stretch more, flower longer, and feed more/less than others.