Mohammed,
with all the Tasks in your system, are you sure you are even getting into the Idle loop? The CPU load is calculated as a percentage on how much time is spent in the Idle loop vs. some other context.
I'd try remove some Tasks and slowly adding them into your system after you get a CPU load to show up. I'd also remove the "Load.windowInMs = 1;" from your config file.
Have you taken a look at TI-RTOS's UART Logging example's .cfg file? I believe that example shows the overall CPU load.