Is a Fatboy set on 9 one of the most aggressive shaves you can get? It's perfect for me but I like variety, and other razors can't match the close shave.
Muhle R89 (old style) is like a Fatboy set on 11!
There's an aggressiveness chart on the Wiki that shows you what razors fall where. Personally, I think the old type Muhle R89 is more aggressive than a Fatboy or Slim on 9. A Slant is pretty aggressive too.
YMMV
Can somebody help me with this one, please.. can't find this "aggressiveness chart" on the Wiki...
http://wiki.badgerandblade.com/index.php/Double-Edged_Safety_Razors_Ranked_by_Aggressiveness
There ya go. But as always, YMMV.