Jimcee what do you mean by "doing longer runs"? Do you mean longer "rides"? And by longer are you referring to 10+miles? Ten miles is a very short distance. So if by "+" you mean a few more miles over the 10 you are still riding a very short distance. Not the distances that should create a saddle problem if you are set up right with a saddle that works for you. Everyone's idea of a great saddle is different and what works for me is likely not to work for you. However a big wide saddle full of gel will not work for most rides, especially if doing any real distance. I am guessing you are sitting up right like in a chair and not leaning forward with hips rotated. I suggest you find a local bike store where you have confidence the sales guys know what they are doing see if there are any demo saddles to try or buy used saddles off Ebay. But something that's going to work for you is not likely to be a big, wide gel filled saddle. If you are serious about riding sounds like you may be a candidate for a professional fitting which includes a lot more than what saddle you're on. And it may be the type of bike you're ridding will always be uncomfortable riding 10+miles.