I just got my lights removed and re-sealed.
So it stopped the leak that was coming in from the top right of the tailight (as shown by a yellow arrow in the pic i posted earlier).
But guess what? There was another problem. The blinker/reverse light was now filling up with water, and that water was entering the boot thru the bulb opening. Apparently, this is very common, because the lense has either cracked, or become unsealed inside. As far as i know, you cant pull it apart from the rest of the tailight.
Anyway, I drilled a small hole on either side of the blinkers/reverse light lense.
If you do this, first take off your bumper, so you can drill the holes from underneath.
I'm hoping this is the end of my leaky boot issues.
Will keep you posted.