I tried the 143 when I got the 155, and my bike came with a 143 Avatar. I found that the narrower the seat in the back (though not as extreme as 130), the less weight I could put on my sit bones, even though they were technically still on the BG pads. They were just too far to the side, so on the really flexible part. That meant that I had more weight over the pubis, and I'd get sore there. Not soft tissue sore because of the cutout, but on the bones. I couldn't stand going on rides long enough to test out the other width issue and chafing, but from what I remember, the insides of my legs still rubbed the sides of the saddle. The Alias was a little cushier than the Avatar, and the Jett is still a little cushier in the middle than that, but they are all about the same width regardless of seat size. The only one that's different is the Toupe, but it is still pretty flat and hard in the middle. I've heard it breaks in well, but it's too expensive for me to experiment with right now. I'm trying to find one I can borrow. It only goes up to a 143 (no 155).

So long story short, if the Jett 155 is rubbing you on the tops of your inner thighs, you won't fix that problem by going down to a 143. You might have a chance with the Toupe 143. In general, it seems you need something with more tapering from seat to nose like I do.

Thanks Surlygirl for your reviews. I'm not sure how much the Jett cutout is really doing for me (in crits or other times in the drops, I wind up riding pretty far forward on the Jett--sometimes it feels a little pinched, but it feels like I can hold a faster cadence and have a higher output in that position). Maybe the SLK lady will work.

I agree that at least from looks the Lady Gel Flow looks as wide in the transition as the Jett. I don't really mind a harder saddle if it fits properly. I liked the light, stiff race feel of the men's SLR. It was just waaaay too narrow in the back.