Ask HN: Who do you go to for tech support?

Where do you turn when you run into a tech support issue you can't solve yourself, even when leaning on the brain-cache that is the internet?

What I thought was a minor issue has stubbornly stumped me for three or four months now: under certain kinds of load, my Windows (10; self-built) PC experiences pops in its audio output due to high latency in processing interrupts.

Having gone down the rabbit hole of performance trace recording[1] and analysis[2] on Windows, as well as ruling out component after component, I'm no closer to solving the problem. (The gory details can be found on my /r/techsupport thread[3] with no replies)

At this point, I would pay good money to a high-level (low-level?) tech support provider that has the skills necessary to debug this sort of problem, but I'm at a total loss at where to find one in the haystack of "IT Crowd"-esque support you find by searching the internet or picking an arbitrary local "PC repair" shop.

So, can anyone recommend a company with a sufficiently deep level of expertise to solve this kind of problem that an individual could go to? Or know where to look or whom to ask to get pointed in the right direction?

[1]WPR: https://docs.microsoft.com/en-us/windows-hardware/test/wpt/windows-performance-recorder

[2]WPA: https://docs.microsoft.com/en-us/windows-hardware/test/wpt/windows-performance-analyzer

[2]MXA: https://channel9.msdn.com/Shows/Defrag-Tools/DefragTools-149-Media-eXperience-Analyzer-part-1

[3]https://www.reddit.com/r/techsupport/comments/l71009/persistent_interrupt_latency_problems_on_windows/