The two split images in the rangefinder on my Super Speed are not very distinct, making it hard for me to align the two images especially in low light. Can that be fixed?

Also they never seem to quite line up.

Is Fred Lustig still in business? Is there anyone else?

Most likely one of the mirrors in your rangefinder needs replacement. Fred does this, and would have to align them as part of his job. I highly recommend him.