Another option to think about is folding out a horizontal 'fish eye' dart in the pattern, which can also help to remove the back-seat 'baggies'. So here's one of my latest videos on drawing this minor tune-up.
If you do make this refinement to your pattern, make sure you test, test, test! Well...one test will likely be enough, but I just wanted to emphasize the importance of testing when you make a pattern modification like this.
And I know many of you groan at the thought of having a CB seam in the back of your pants leg, but if it improves the fit no one, or very few, will ever notice it. In fact, you'll get compliments on how well your pants are fitting.