The soreness will level out. The elliptical used to beat me down, but not anymore. You are doing a lot, whether or not it is too much is only a question you can answer. You do 30 mins M/W/F then strength training, I would suggest flipping that if you could. I find I'm a lot
more sore if I do my cardio before strength training - I tire the muscles with the cardio and then end up overtaxing them with the strength training so I end up in some serious pain a lot of times.
On the days I do both I start with a light warmup, some jumprope of 5 mins of light cardio, some lower weight lifts, then my main strength training, then 20-30 minutes of treadmill, bike or elliptical as a cooldown, though it isn't really lighter than my normal cardio, just shorter duration. I try for HIIT with my machine cardio, so don't typically go beyond 45 minutes, and that is pushing it.