7's should be easy enough to accomplish from there. They are only draining the pack 15% per run - with the controller throttled down by more than a third!
I believe it's follow up run on Sunday posted an 8.16 @157 MPH. It seems that the motors are the primary limiting factor at this stage. But seeing that they have extra battery capacity that they could shed, even if the motor limitation is not improved, quicker times are probably in the near future.