That puma should shave just fine.

I'd go with either a bigger razor or a thicker grind (either one works). John Crowley has some 6/8 quarter ground razors that would be just the ticket, or a Wade & Butcher barber razor. Or one of Crowley's friodurs or framebacks.

If you want the full sweeney todd effect, go with a big Wade & Butcher, Wostenholm, or Rodgers 8/8 frameback.