Hey Niagra to answer your first question you topped them perfectly for the 2nd topping. You should have 4 branches where you originally had one. The brown tips are nutrient burn from a previous overfeeding. May have been hot soil. That damage won't repair, but that won't affect her. What I see going on now with the yellowing is a lack of nitrogen. I suspect you may have been overwatering and this causes lockout so the roots can't absorb any nutrients. The best thing to do now is let them dry out quite a bit then start give them a half dose of nutrients to get them back on the right track. They are still in good shape and should recover pretty quick.