I know this is an old thread, but it popped up for me, without me doing any searching, so I thought I'd add a response to the question about determining if TRIM is on. There is a utility in Windows 7 that will tell you whether it's running; FSUTIL.exe.
To use it, open a command box with admin privs, by typing CMD in the Start > Run box, and hitting CTRL-SHIFT-Enter. In the command box, type "fsutil.exe behavior query DisableDeleteNotify" and hit Enter. (It's not case-sensitive. That just makes it easier to read.)
If TRIM is running, it will respond with DisableDeleteNotify = 0.
If it doesn't, type "fsutil.exe behavior SET disabledeletenotify 0", and hit Enter.