I love my 39C. It's very efficient, in that it cuts hairs effortlessly, especially multi-day growth. However, I find it lacking in aggression. Yeah, it's got a big blade gap (well, on one side of course), but there seems to be near zero blade exposure, beyond a line tangent to the cap/guard. I was thinking of giving the vintage slants a try to see if they are any more aggressive. The pictures I've seen of the Hoffritz slants look very, very similar to the current day Merkur, in terms of the head design. So, if someone has both that they can look at, are they identical? I know it's not obvious what the blade exposure is just looking at it, but if the head geometry is different at all, I may try grabbing one, just to see if it shaves differently.
And yeah, before anyone mentions it... I have thought of trying the R41 ..that is a thing of beauty (as well as other more aggressive regular razors)! My vintage gillette adjustables turned up aren't really cutting it for me either. I'm probably headed for a Futur or R41 at some point.