Haha, maybe your Idea isn´t that far fetched after all.
It could very well be....Since I was still playing around with the settings (but always through the WebUI, not via Console) while I was doing the Preclears. Preclearing the drives was pretty much the first thing I did when I booted up my server for the first time ever.
Although I think I already had the time-settings already set up, it might be the only logical explanation.
Because whenever I checked on the Preclears I saw speeds of about 150-170 MB/s, which would make it very hard to get an average of 200 MB/s.
You Sir, think like a Detective