I haven't had this experience at all. In fact, it's one of the most bass heavy pedals I've used in my experience. Even more so than some bass specific pedals I use. The Ultimate Drive certainly has less low cut than the OCD (the 1.4 version I have, at least). With most of my dirt pedals they're always on or at least not bypassed during a song, I may switch between songs. So there might be a small negligible loss of low end, but nothing dramatic or very noticeable. I don't know your signal chain or how you're using it though, so I'm not saying you haven't experienced it. One of my most used overdrive pedals for years was a vintage DOD 250 and it had a bit of low end loss but much less than a lot of other pedals I tried to get the same tone and it has significantly more low end loss than the Ultimate Drive and I've compared them directly.