I have the M1, M2, R1 and S1. I think the M1 is milder than your razor. I would recommend the R1. Personally, I have not used anything but the S1 since it arrived - but it's the only slant I've ever used so I'm no expert on comparing that to what you already tried and didn't like.
Some of your choice probably depends on the blade. I like the R1 and S1 with a Med Prep/Lab or PolSilver SI, but it doesn't work as well for me with a Feather or Gillette Blue. I find it takes a few days to get used to a new razor. These are all nice - enjoy.
Some of your choice probably depends on the blade. I like the R1 and S1 with a Med Prep/Lab or PolSilver SI, but it doesn't work as well for me with a Feather or Gillette Blue. I find it takes a few days to get used to a new razor. These are all nice - enjoy.