Detailed performance counters from Powershell

I've been working lately on a small script to pull some metrics from our Compellent arrays and stick them into a Graphite database, which eventually end up getting used to make pretty pictures in Grafana. It started out as a way to get some historical data for numbers that Enterprise Manager doesn't store history for (eg. capacity used/available per raid-level per disk-tier), but now it would also be nice if I could pull some other data over just to have it all in one place.

I've discovered a small collection of cmdlets that return IO Usage stats (reads, writes, latency, throughput, etc.) by volume, server, etc., but it doesn't seem possible to get any more detailed resolution of those metrics than once every 15 minutes - it seems to correspond with what you would see in the gui under the 'IO Usage' tab.  But in the gui there is also the 'Charting' tab, which seems to have access to all of the same metrics but at 10-second resolution, which would be perfect for me to dump into graphite.

Is there any way to access that higher-resolution IO usage data from Powershell?  Or any other ways of accessing it?