Well it depends on what you want to do with corals and placement. I would just go with what you have for now and see how it works for you. If you have a PAR meter, you can instantly see where your at...if not your corals will show you. Don't believe all the hype on the LED stories. ALL Led fixtures do not have the issues that everyone likes to complain about. If you do your home work and buy the proper fixture and amount of fixtures needed to diversify the light the way you need it. You will not have an issue. Keep in mind, each manufacturer of LED lights is usually a little different in power, spread, and diversity of LED's. The best thing you did is buy a fixture that makes it easy to add/remove fixtures as needed. Personally I would have the same fixture all the way across, but maybe you did that for how you will be placing low and high light corals.
Any way it goes... I like your setup. Its easy for you to make adjustments. Good luck and keep us posted. Allot of people will need to know how many of these of fixtures are needed for certain types of corals.
Happy Reefing.