Thanks to Mikrotik.
I got 433AH & R52Hn mini PCI configured with ROS 5.9 and dual pol. sectors. Nv2 has charmed. Awesome performance. Screenshots attached 1st is with SXT client 2nd is RB 411 with R52. Getting 100mbps is what I used to dream about. I am sure the links can be bettered. Using 20/40 MHz below HT.
When I used 20/40 MHz above HT the bandwidth test varied a lot sometimes going in kbps. I still don’t know why… 
Your CCQ is really bad. First thing I would do is check alignment then try a different channel.
For wireless N at 20/40 MHz I have seen low CCQ’s and with NV2 CCQ is low unless there is traffic on the link. What matters more is the throughput I am getting. Infact what I have discovered now in ROS 5.9 is that TX/RX bytes start counting after I log into the Winbox. Alignment is not an issue as all clients r SXT or patch antenna with clear LOS. Channel s also correctly chosen with least noise.