I'm curious how you got the LED lights to work in the rear. Mine would not work properly if I had LEDs in the front. Both taillights would flash when I turned on the turn signals. I tried 3 different LED bulbs and they all had issues. I ended up using Sylvania LEDs which were supposed to stop CANBUS errors but they didn't work right either. If I installed incandescents in the front, everything worked as it should. I diagnosed it as a problem with the flasher. In order for the flasher to sense that it needs to start flashing, there's a small current sourced to the lights. That current is enough to turn on the taillights when they shouldn't be on. I was getting some back-feeding and cross-feeding through the bulbs. Brake lights worked fine, but the signals didn't. I added two small resistors to the taillights inside the car, and it fixed all the problems.