A hard, slim saddle can give you support where you need it, and freedom of movement too. Swap it out if it sucks, but try it first. My roadie has a very hard saddle, but it never gets uncomfortable. My tourer that I use for commuting has a slightly softer, but still pretty small saddle, and also never gets uncomfortable. I have a mtb/cruiser thing with a huge foam monstrosity on it, which is nice to sit on, but rubs if I try to do 20 miles on it.