Mac Mini drive read/write 20MB/s

I've been fighting a slow drive for months and have yet to find a solution.  Most recently I installed a 1 TB 7200 RPM drive from OWC, cloned my drive and find the new drive measures about the same read/write speed of 20-25 MB/s.  I'm at a loss to find a solution.  Interestingly when I test the stock 500 GB drive that is now reformatted and empty I see it measures 50 MB/s read/write.
The drive has about 300 GB of 1 TB free and should be relatively fragment free since I copied over the data in one swoop.
I've seen others suggesting a format/reinstall but that sounds to me like the Windows mentality of "hiding" the problem instead of locating and resolving the issue (e.g. reboot and see if it goes away...solved!).  Notably, if I take the time to reinstall and reconfigure after formatting how do I know I won't just end up in the same circumstance again.
I appreciate any suggestions to locate what might be causing the slow speed or any troubleshooting tips to narrow the culprit.  For example, I ran...
kextstat | grep -v com.apple
...a while back and discovered I had FSEventer still installed from long ago when I tried it out briefly  It installs a kext that tracks all filesystem activity so it noticebly affects read/write speed.  Removing that moved me from 15 MB/s to the 20s.  Now kexstat doesn't list any non-Apple kexts.
I appreciate any other suggestions to discover drivers or really software of any kind beyond default Apple provided OS-level stuff that I can systematically eliminate in search of a solution.
Thanks for any and all help!

Hi, I'm thinking reformat isn't the way to go, leastwise not yet!
You get these speeds copying to/from what?
What size Cache is this new drive?
How is this drive connected, internally or externally?
Might try Etrecheck...
http://www.etresoft.com/etrecheck

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