I have not been able to find a saddle that does not cause chafing exactly where you are describing on rides of 50+ miles or back to back long rides, and believe, me, I've tried; however, others have, so definitely try to find one. What I do to prevent is a first layer of pure shea butter then a layer of chamois butter (or equivalent), reapply chamois butter at every stop. This works for rides less than 50 miles. The next step for longer rides is to apply a layer of liquid bandaid or nu-skin. You can apply it the night before. I dry it on a low dryer setting so I can do two layers. Then I put chamois butter on top of that and re-apply the chamois butter at every stop. That worked for a 82 mile ride last weekend. The next step, if that doesn't work or if it is a multi day ride and you want to be sure not to chafe, is to use some type of physical bandage such as a blister band aid or I have had success with other tough, water resistant band aids. Make sure skin is dry and oil-free before applying. These have stayed on through long hot rides, but take extras just in case.
Grits
2010 Trek 5.2 Madone WSD, SI Diva Gel Flow
2002 Terry Classic, Terry Liberator