The issue is with the SSD's QLC NAND flash technology. Basically the write speed is because they switched from TLC to QLC. Had nothing to do with my hardware. More info here: https://allinfo.space/2021/08/17/crucial-p2-ssd-switching-to-qlc-nand-massively-reduces-performance-in-practice/
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The Black Magic Disk Speed Test was showing slow write speeds because of the cache or whatever being full. We were giving it too much data to write in too short amount of time by running the speed test over more than a couple times.
@danj Just wanted to let you know what I have found!
''UPDATED ANSWER''
The issue is with the SSD's QLC NAND flash technology. Basically the write speed is because they switched from TLC to QLC. Had nothing to do with my hardware. More info here: https://allinfo.space/2021/08/17/crucial-p2-ssd-switching-to-qlc-nand-massively-reduces-performance-in-practice/
@danj Just wanted to let you know what I have found!