I kinda like it, you have a nice balance going on with the AI and AT. A lot of Splinter Cannons and Shardcarbines, great for taking out the infantry. And 2 Ravagers and 4 Trueborn for taking on the tanks.
You may have a problem in objective based games with only 2 troop choices, but you could make it work.
Why do we ride atop these elegant craft? The better to hear the screams of our prey as we ride them down, to savour the fear etched on their faces, to taste the tantalising tang of their blood in the air as an appetiser before the feast. But most of all we ride them so that the slaughter may begin as soon as possible.