Just something to consider - why there are road saddles and MTB saddles...

Typically on a road saddle you position yourself and seldon if ever do much moving around (yes I do sometimes when climbing either sit back or move forward) but on a MTB saddle there is alot of moving around. You need to have a long narrow saddle so you can move forward agressively while climbing and have something your thighs can clutch while you pulled back for descents. Not saying a road saddle won't work just saying there is a purpose to a MTB saddle. I also find I don't need a cut out on my MTB saddle, just not in one place long enough for it to matter in fact, it would probably be a hindrance.