You do not understand me. You have to test the set (M2+RE) step by step. So, try to do the same as I did. If you will get the good result you can do the other step.
I did REGULAR + 720p, works fine
I did REGULAR + 1080p, works fine
I am going to do FullHD + 1080p and FullHD+720p/60.
Use 2,4 and 5,8 auto as I do.
If an issue found in the steps, the source of the issue could be more pointed.