This might all depend on rail length and position. Measure where your butt goes on your current saddle when it's in the correct position for balance. See where your butt position is w/r to the rails and the stem. Then go look at conventional saddles in profile and see if it looks like that same butt position could be attained with the seatpost clamp in a decent spot on those rails. If it looks good, try that saddle on the bike, going by butt position from stem only. Ignore the nose to BB distance.
Could be lots of other things, specifically saddle height and angle, butt conditioning. shorts and pad, not standing enough, etc.
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