In the UI look for the session in the Netstat page. If TCP-X is not enabled the session will not show up.
2.7Mbps over a 20Mbps link with 40ms does not sound right. Maybe testing over a bad WiFi link? It seems very low.
Also TCP-X is designed for higher latency, not sure what the result will be at 40ms, but 2.7Mbps is way too low for a 20Mbps link.
To test the performance between the two instances:
Appliance 1:
cd /tce/www/redirect/
dd if=/dev/zero of=speedtest.file bs=1M count=100
Appliance 2:
wget http://appliance-1-ip/speedtest.file
Usually this should at least be around 100Mbps over a 20Mbps 40ms.