So I found that both my Mac mini & MacBook Air (One running Sierra & the other running High Sierra Beta) has high Ram usage with kernel_task & windows_server using the most Ram. So I contacted Apple Support and they told me to try and clean install, that it could be corrupted files or something wrong with files that could be causing that issue. So did a Clean install and did not restore from Time Machine, instead did a manual transfer from Time Machine of my files I needed. The apps I just reinstalled. Now on both machines kernel_task & Windows_server are nowhere to be found in the Activity Monitor and I noticed my machines are running a lot faster and the Ram usage is down on both. As you can see in the picture, no kernel_task or Windows_server to be found.