Your stats are interesting, except there was no NFL team in Los Angeles in 2015. According to ESPN, the Rams had the second highest attendance in the NFL for 2016 at 84,457 per game. Another source puts them in seventh place at 74,131 per game. Perhaps that's the difference between tickets sold and actual butts in the seats.
Where did you get your numbers that the Rams are the worst draw in the NFL?