Is anyone else having huge response times in their polling of a Cisco 3750 stack?

I’ve increased the number of pollers I have to something close to 17, but my 3750s seem to take forever to respond (anywhere between 200 – 999.99+ seconds). It may be an issue on my 3750s, but my polling intervals on my devices is several hours.  

I have 2950s and 6509s that don’t seem to have any issue responding in a short amount of time (<20 seconds).