Prime nocturne and obsidian ashes are both 1 second longer than prime lunacy of vedir and phamtasmal snare, the skills you're pretty much almost comboing them with. If you're on top of using lunacy off cd and try to use nocturne you end up mashing rmb for a full second waiting for it for a full second. Same with phanta snare and ashes. Prime nocturne and ashes should have their cd's reduced by 1s to match that of the skills they follow. It just makes them flow a bit better.