Steve

Almost 2K points in just one month

The SF based drives are great for pcmv but they do need to be fresh, performance drops on the SF drives just like other drives.
Still, I don't think it is possible to beat your setup using current SSD's, mainly due to the exceptional performance of the Acard's at low QD.
(some new controller with a huge cache might help a bit, however, it does look like the huge cache might disappear, other/new solutions will take over, e.g. CacheCade, MaxIQ, ...)