Yes, I caught the typo "lip" and meant "rib" (already changed on my post).
No, the range staff confirmed as flat rib near the breachhead of the slide (where the case base is held by the extractor). The XD slide rib is angled towards the back of the slide and not forward, like most pistols. This works with most bullet profiles that does not have a sholulder at the case neck, but they reported shooters having extraction issues with SWC bullets.
Since you reported you successfully shot SWC bullets, I was asking if XD reworked the slide rib or what has worked for you. Perhaps your bullet is not seated as deep near the case neck and therefore the spent case base is "riding" on the top of the bullet shoulder instead of bumping into the case neck.
Would appreciate your comments, perhaps to help other XD reloaders.