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One person should have consistent measurement parameters yes but he doesn't need to follow amir's parameters. Especially when some parameters are not working very well.
Why use the same parameters? We need some varieties in the measurements. And 20/22khz bandwidth in much more meaningful than 90khz. Using 90khz is like: hmmm we can't see harmonics after 20khz causing thd to drop after 7khz so lets add more noise so that we can't see any distortion!
The current setup is very good you don't need to change it.