Excellent work Martin, before moving to a dedicated planetary camera I used to use my Canon 700D with BYE for planetary. These are excellent captures, and I'll just give you a few tips on your process. I assume you are capturing the LiveView images at 5x zoom? If not, read this.
https://www.astropix.com/html/i_astr...esolution.html
First, you should be able to capture Mars for 5 minutes without worrying about planetary rotation, this will give you more frames to choose from. Your focal ratio is pretty much bang on, the 4x PM should give you close to the optimal f/num = 5x pixel size for planetary imaging. In AS!3, you can use the sliders on the top LHS of the viewing window to reduce the size of the image you are stacking, that way you don't need to waste a lot of time stacking black space
Other that that, really impressive results