I was having a similar issue with mine, couldn't hurt to be positive on that though, would suck to have gone through all of this for it to only end up being the wrong standoffs lol
put it all together on PCpartpicker and then divide out maybe 30-50% depending on how long you've used the stuff for and/if you've overclocked some of your components. Based on this I would say maybe 1500-2000 depending on your usage of the pc.
At this point, I think that I'm starting to over think this; maybe my idle temps are okay, they aren't really causing any issues with my system. In real games rather than running a stress test I max @ like 60-70c so there's probably nothing wrong.