Arowana will only run on 34nm Nand Vertex/Agility/Solid2 drives, so unless you have a drive with 34nm Nand on it, Arowana will not work.
Vertex Plus is not "far worse than SF-2000" is.. already released a firmware update and have another one ready. Should resolve the 2 issues we have seen.

Vertex/Agility have ALWAYS had anemic 4K's in AS-SSD, no Cognac build will change that. Also, the smaller the drive, the slower the 4k with that controller.