Replying to Skis are weird

Not sure if this is truly an SG topic or not, but I own a pair of Ace of Spades and a pair of APO Kai Pro's. I have been using the Kai pro's for this season, but yesterday I pulled out my Nordica's.
When I hit a rail, I noticed that the Nordica's gripped the rail much better and I was more stable on the features. It felt like it was more difficult to slip off a feature which was something that interested me and felt very weird even though the sidecut of these skis aren't too different (86 underfoot/87 underfoot). I am not sure what to think of this or even why and how it happens. What I am wondering is if anybody knows what makes this happen. I can understand stability on jumps, but I never thought I would get that feeling on rails.