These problem with these 2 items above is because DNC can either have a really smooth and dynamic gameplay, or a really slow and clunky gameplay, because our weaving-in oGCDs abilities are gated behind the mercy of RNG luck. So, in my opinion, would either making feather generation a bit more reliable, or making Saber Dance an oGCD.
This ! it get to slow often.
An idea would be to get a skillspeed bonus on Fan Dance III.

3) Curing Waltz needs the range doubled, because the utilitiy of the spell is almost negated if you really can't catch a lot of people (sometimes including yourself) in the double heal. In my experience, the only moments you'll find the party intentionally REALLY stacked in that range, is to make sure everyone is receiving Cure 3 from WHMs... but then, in such occasion, Curing Waltz wouldn't be that useful, since Cure 3 is already very strong.
Standard and Technical Finish needs to have a longer ranged wide.