@mgutt thanks for the response. Via another forum is was also doing tests and trying out advise but in the end when having +- 45 watt withouth the disks attached I knew something must have been wrong. I replaced the meter and now with all dockers running and my disk array spun down I have around 18-22watts of powerusage which is very acceptable for me.
I would really like to thank you for doing the tests and efforts that you did and sharing this with the communicty. On a different forum we already have a couple of guys with similair builds as yours all benefitting from your information, so thank you very much!