I like the color, and it looks like you captured some morning clouds/fog. Color registration is pretty good. Detail is subdued and slightly over-processed for my taste.
Your acquisition settings are helpful, but there are many other things that could be causing surface details to be washed out.
Did you shoot this with your 12" LX200 and 2x Barlow? How do you collimate and focus?
I see you captured 180 sec at 3ms exposures.. that should be a good combination. You could get more bit depth if you capture to ser files instead of avi, but some folks here say that shouldn't make much of a difference, and that certainly would not make your detail more sharp. The only other thing I see in your capture settings is your ROI. Use a square ROI to reduce data volume to disk unless you specifically need extra margin for Mars to wiggle horizontally across this view. More importantly, if you could afford to tighten up that ROI (without Mars getting too close to the edge as it dances around), you could potentially capture more frames. A 360x360 ROI uses 42% as much data volume per frame as the ROI you're using. Using that smaller ROI should more than double your frame rate and ultimately yield twice as many keeper frames as you're currently collecting. That may allow you to be more selective (use smaller percentage) in your stacking.
What does your histogram look like in Autostakkert? At what frame count percentage does the quality graph cross the 50% mark? What frame stack percentage did you stack? Using too high a percentage will blur your image, and the quality histogram is key to picking stack percentage. You could also try making multiple stacks with varying percentages. Try as low as 5%. Are you using drizzle? If so, you probably want to scale your image back down 50% or less unless you have crisp 1-2px scale detail. In my limited experience, I very rarely capture fine enough detail to support the 3x drizzled scale, so it's almost always necessary to scale back down. It's still useful to drizzle and do your processing at 3x, but scale it back down afterward. This is counterintuitive, given the lengths we go to for magnification and detail, but this will make your image look sharper and more interesting.
What wavelet settings are you using in Registax? It looks like a bit much of the levels 4+, and maybe even too much 3. It's very tempting to crank those sliders up to boost contrast, but the higher levels make the image look over-processed, and in this case, it makes Mars look flat (in my opinion).
The main thing limiting detail here was almost certainly seeing, especially if you're confident in your collimation and focusing. Some of the suggestions I'm describing here may help a little but it may be that surface detail information was just too scattered.
Hope some part of this helps..