How often are you doing each? If you are doing back and forth upper/lower then it probably would be too much. Your lower back takes a while to recover, as long as your legs. On the other hand if you are doing legs on Monday and the deadlift on Friday, like in a leg/push/pull pattern, you would probably be OK. An alternative might be to substitute deadlifts for the Rom deadlifts every second leg workout. To lesson the impact on your back, subtitute front squats for back squats that day as well.