Just as a general guide on how I worked as a CN - it has a lot to do with the relationship you have with your senior and junior staff.
CN is a pivotal role in turning theory/policy into action/practice. The more or less a CN's manager does in this pivotal role - the less or more they have to do. The more or less the subordinate/junior staff do - the less or more the CN has to do.
A unit generally has a specific clinical role. The aims are usually the same - admit; assess&diagnose; plan; treat; evaluate; discharge.
I consider it the CNs role to ensure the team perform this order of things in completing whatever tasks are necessary to reach discharge.
The CN can also assist in general admin (stats/data); staff management (including Performance Appraisals & Reviews) and teaching & development (education; p&p; audit) - depending on how good they are and how their manager manages themselves and leads the team.
There's some good stuff on "leadership" that breaks the roles of any position down well - the grade usually determines the extent or level of what they can get involved in.
Intersting recent NZ article:
In short - the more the higher managers do - the less the lower ones have to. eg: Don't tell them HOW to complete the running of the ward - just tell them the standard you expect and let them work it out. Similarly, don't take on the role of telling the junior staff what to do or what they're missing - tell the CNs and get them to tell them and single out the CNs responsiblity in the order of things.
If you want to highlight the deficits I'd suggest some simple audits that to indicate the stuff that's getting missed and establish some performance goals - eg all charts will have proper entries; -
Set your team "performance indicators" - and again, be sure not to put yourself as primary auditor/checker - make it the CNs responsiblity to report back to you at every CN meeting - let them do the 'thinking' and 'doing' to solve the issues - then tell them you'll be auditing with them on the 3 monthly mark or so to verify standards.