M105/M205 is the professional paint-shop safe version of Ultimate Compound/Ultimate Polish. If you need more cut than Ultimate Compound, you'll need to use a more aggressive pad or faster speed. However, in my experience on 4 cars using Ultimate Compound, I never needed more cut. In fact 3 cars I didn't go beyond Ultimate Polish for specific bird bomb areas and one car no polish at all, just paint cleaning.
There is only so much clear coat on your car. Keeping that in mind, simply cleaning the paint with clay bar and then using a light polish to scuff off swirl edges and contains fillers makes a car look 95% as good as a perfect scratch free vehicle for the average joe. It's only detailers or concourse judges that'll care.