Possible saddle suggestions?

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Okay, I know I have gravity working against me because of my weight, which will make any saddle uncomfortable, but darn it, I've been riding 4-5 days a week, 20 - 25 miles at a time and just can't finish a ride without my... err... posterior feeling like I got kicked by a mule. Isn't this supposed to improve over time as you toughen up? I'd like to work up to doing a century at the end of the summer, but honestly can't see how I could stand the saddle time.:eek: I have no doubt that if I continue to ride and improve over the summer, my fitness level will be up to it.

Currently I'm using a Terry Liberator on my road bike, a WTB Speed V on my mountain bike and some generic fat cruiser seat on my comfort bike. Basically the same results with all of them over time. If there are any larger folk out there with suggestions as to what works for them, I'm all ears.