When you're coming from super bassy headphones (like the M-100s), you sometimes need to give your brain some time to re-adjust. I love powerful bass that's tight, fast and powerful. I do not like slow, muddy bass that bleeds into the mid-range, however.
From what I've heard and read, the Fostex TH-Series do a great job of this. It's easy to get a large quantity of bass; it's altogether different to get bass that's of high quantity and quality. I know "quality" is subjective, but I would just say to try to get acclimated to the Ebonys. Once you get used to higher-quality bass, bassy cans with poorer definition start to sound flawed in comparison.