pelvic tilt and aero position

I'm having issues with tilting my pelvis forward for more than 15-20 minutes at a time due to pressure issues with the seat (numbness).  As a result I'm having hip issues that require visits to the chiro.  I'm going to get the ISM seat, the LBS has a demo seat they let people try, so far they say the order rate is 100%!

I read that the women's ISM is currently being developed.

Not sure how a man's point of view applies, but my numbness issues got worst on the Tri-bike aero position than with the RB aero position. I'm a lot lower on the TB than on the RB.  That said, the Tri-bike aero position is more comfy when I can be in it!

As a former mechanic, bike salesmen and Cat. 3 roadie who has fit hundreds of people on bikes the biggest problem I constantly saw was a seat tilted below level ..........

In my worthless opinion you should never have the seat below level and in reality it should be just slightly above level.  The reasoning is that you will "fall" forward putting more stress and strain on your upper body which leads to fatigue in your back/shoulders/neck/arms.  Your upper body will be fighting to maintain the position on the saddle instead of letting gravity and the seat do it.

After 2 professional bike fits and 4 saddles, this is finally what I had to do -- tilt the saddle forward a bit to alleviate the horrible soft tissue pain.  BUT, it's exactly like you said -- it is SO hard on my upper body to sit like that for long periods of time.  I still don't know what the problem is -- the bike, the fit, or the saddle itself.

Autumn,

Lots of good information already. I roll my hips and I can feel my lower back flatten. I  sometimes, sorry no way to put this delicately, rip/remove skin from my privates while doing long rides....and it is just bad luck or not using enough chamois butt'er & body glide or it could be not rolling hips enough....but it is quite unpleasant.

In 2005 I rode with the Terry Butterfly Tri saddle on a road bike w/aerobars, this year when test riding tri bikes most came with smaller harder saddles which I liked. So when I ordered my tri bike I opted for Terry's racing saddle Zero X with the same cut out and wider seat for women's sitz bones since it came with a 30 day money back return policy.  I like it so much better. I think it takes time but your bum gets used to riding more and more and the harder saddles are really more comfortable...less stuff that gets between you and your saddle is better. You have ridden a lot and I wonder if a harder saddle may be the key for you.

Other key I'm not sure if it has been mentioned is bike fit. I have a bike fit guy who has done over 5K bike fits and used to design bikes with Seven when working with customers to fit their custom bike. I think bike fit helps fix lots of bum/saddle issues. Hardest thing to know is who really fits a bike well. Everyone says they do it, but how good are they? I had mine fit 3 times and now only go to Roy as he fits my bikes so I'm pain free and I had back surgery 10 years ago.

It has taken me a bunch of rides and two fittings to get me comfy on my tri bike after being on a road bike for 3 years.  I got a new saddle Terry Gellismo (?).   I need a new pair of shoes and I'll be in bike heaven.

At first, I HATED the thing.  Really.  I just had to get used to it, I could feel different muscles being used for some reason.  My thighs have never been so sore.  My cootchie feels a lot better though, but I think it's the new seat

http://www.floridabicyclesports.com/systemone.htm

the above link is a picture that describes Autumn's original question.