Funny you should ask that...because after I read your post it dawned on me that my SLK does the exact same thing! There is absolutely NO separation of the two halves...whatsoever...so basically, there is NO cut-out. I also started another thread awhile back, about another issue that I was having with my SLK. The left side had started to sag or drop lower than the right side. Did you experience this with your SLK saddle? I know that the 2 sides are supposed to "flex" with the rider's pedal stroke...but it got to the point where I was actually able to feel a "ridge" where the left side had dropped down and it was causing some chaffing and pain. I contacted the place where I bought it (gottaridebikes.com) and mentioned it to them and they suggested that I send it back to their distributor for warranty evaluation. But when I contacted the distributor directly, they made it sound like it was my fault and that the ONLY way the saddle would become uneven like that is if the rails were bent (which they are not). So I never bothered sending it back to them...figuring that they would just tell me there is nothing can do about it anyway. I ended up relegating that saddle to my "back-up" bike for now.
Linda