Photos would help. I wish I could give you an easy answer, but it seems that ph is not your issue. Do you check your runoff to insure your soil is still 6.5? Have you treated them with any cal-mag lately? A mag deficency looks a lot like a nitrogen deficency.
Anyway, good luck and good growing!
Check out Ebay. There are a lot of online hydro-shops there with better prices. Gotham is where I purchased my new 180 watt blackstar led.
I too started with cfls, and they work real well for vegging, but better quality buds from HID. But future belongs to led's. Pricey up front, but very long...