I did not try removing the window and installing butyl tape. I was able to press hard against the siding and get DICOR behind the frame. There is no visible crack in the caulk right now yet there is still a damp spot forming in the wall below. I decided a possible entry could be that from where the awning mount is at the roof edge, it forms a dam and all the water that should be pouring out the end of the gutter is forced to pool then surge over the side which is directly above the edge of the window and the bottom mount of the awning. When it rains, there is a constant flow of water going over these two locations. There is the possibility that water could be surging the bottom of the window frame and back flowing in through the windows weep holes. I have seen water accumulation in the bottom of the window before. I decided to install this drip rail to prevent water from ever getting to the window or the awning mount below. This was the only method that fixed a problem on the other side of the TC and it will work fine here too I'm sure. Function over beauty at it's best.
