Souveran PASTE is *NOT* a very slick wax. I like it and all, but it sometimes gets a downright soft, or "tacky" feel after a little while. Never tried the liquid Souveran, so dunno about that.
*I* find that 3M's Showcar Paste Wax leaves a very slick finish. It doesn't STAY all that slick for a LONG time, but it's sure not bad for a carnauba. Almost an "oily" feel (I mean that in a good way). Others that seem slick (to me) are the "heavy" waxes, like Meg's #16 and Collinite. These three are all the sort of waxes that "dirt doesn't stick to"; they "self-clean" in the rain.
When I used P21S (over VM, which leaves a quite slick finish too), I didn't notice it being *especially* slick. But then, I wasn't looking for that, so I might not have noticed (but then that tells you something too). Note that virtually ANY good wax will feel pretty slick right after you apply it.