Latency issues with Mac mini

[lucidlife]

I had this issue a while ago, and thought I fixed it but it's back.
I'm having latency issues in my headphones when recording vox.
I tried all Buffer settings. At the lowest its sounds like my vocal is doubled. Empty session no plugins.
Delay compensation is off, and so is ignore playback errors.
I muted signal in console as well, and the cue is set to mix.

Before going through a fresh install of everything I went through the optimization guide by pt. I also downloaded a program that trashed prefs in pro tools. Nothing worked.

I'm not sure where to go from here lads. Any help is much needed since I use this to record clients. If this is happening I'll lose them.

Thanks!

Model Name: Mac mini server mid 2011
Processor Name: Intel Core i7
Processor Speed: 2 GHz
Number of Processors: 1
Total Number of Cores: 4
2x 8GB DDR3 1600 MHz memory cards
Boot drive: 1Tb SSD
Server: 750 GB SATA Disk

Interface: Apollo Twin mk2



I did a fresh install of High Sierra.
The only things I have installed so far are:
Ilok license manager
UAD software
Pro tools 2019
Avid plugins
AIR plugins