Cy7C68013 USB RAW - Visa Read buffers

Hi

I'm using a CY7C68013A to stream ADC data to a PC. 

On the PC side I'm using a visa Driver (generated by the NI-VISA driver Wizard) and using USB RAW, I'm able to start transferring data to the PC.

Trying to speed up the streaming, I'm using 3 Visa reads in parallel (3 different while loops)) feeding the data to a queue, but it does not seems to have any impact (when compared to a single VISA read)

The ADC is generating about 8.6MBytes/Sec.

Any suggestion?

Thanks in advance