So this is a finished quilt you are washing? Washing again in Synthrapol will probably take out more of the bleeds. Synthrapol suspends unset dye particles in water so they are rinsed away. In my experience, Synthrapol is more reliable than color catchers; however, Synthrapol requires hot water.
If you don't want to use Synthrapol, then I would try washing again to see if I could get more of the bleeds out.