Are you monitoring temperatures on it?
In any case I think the POS software may be the main culprit, as it normally runs on a standalone machine and wasn't designed for power savings. I did set the Windows VM it runs in to "Power saver" but it doesn't seem to have helped much.
(Sorry if this is off topic for the thread!)
If not prepare for a performance boost, and a quiet Fan ;)
https://github.com/hirschmann/nbfc
I'm asking because I'm wondering how often it hits 99 degrees and throttles. And if it doesn't, I really need to take a closer look at it, because that would be incredible.
Dell and HP machines have this problem, 6 core Intel processors run slower than 4 core ones because the former always throttle (even though the TDP is supposedly the same).
If you want, you can use Throttlestop to set better controls/limits on clocks and power (and possibly undervolt it) for better performance, battery life and temperatures.