There is nothing wrong with your ssd. TRIM is not an ssd feature. TRIM is a Microsoft Windows feature that was first added to Windows 7.
There is nothing wrong with the Windows TRIM feature. You wrote: "fsutil behavior query DisableDeleteNotify gives a result of 0." The O means that TRIM is enabled in Windows. TRIM is enabled by default. You would have to go into the Windows Registry and edit it to disable TRIM.
Here is a link to an article that explains how to properly check TRIM and how to enable if you disabled it for some reason:http://www.howtogeek.com/257196/how-to-check-if-trim-is-enabled-for-your-ssd-and-enable-it-if-it-isnt/