Did I understand you right?--You have your clones in your flower room, with your now-flowering plants and your light schedule is 9.5 hours of darkness?

If I understood you right, you need to keep your flowering plants as near 12/12 as possible, and your clones as far away from 12/12 as possible. I wouldn't go tighter than 18/6 on clones. 'Nothing more than my opinion.