I really don't like the dead end wall when hitting the cap since I'm getting almost no reward from running it again with FC members who didn't reach their cap.

I say bring back the fatigue system and apply it to tome stones. Fatigue should be severe so you can't get a lot more. This way we are some what rewarded for running it again after fatigue starts to set in.

E.g.
300: 10 runs of WP
+100: 10 runs of WP
+100: 20 runs of WP
+100: 50 runs of WP