The plants obviously still going to grow in height a bit. Thats nothing to worry about. As long as its flowering, just give it time and be sure to check those trichs with a loupe.

I still dont understand why you have to drop the light schedual to finish them off. If they are already flowering under 12 hours light, just let them go, they will finish when they want to finish. Not like changing the light to 8 hours is going to magically finish them instantly. :S