I feel your pain. I have the same situation myself. 2 different plants in same DWC tub. Not a good idea for a stealth grow. I have tied back my bush that hasn't caught up with the smaller of the 2, bud wise. I hope that this will be that last feeding for the small plant and then depending on the trichomes a week from today, both plants will get a flush for a week or 2. Harvest the smaller plant and then start feeding the Critical bush. Switch the light cycle to 12/12 to get it to start budding.
Good luck on your grow!