No, not full scale, set a 1K tone at your operating reference level.send a pure tone at full scale from my DAW
TV and Film use -20dBFS Music uses -18dBFS, others use -14dBFS
When you loop the tone back to the D/A the reading should be one of the above youve used.
Does your DAW have analog output adjustments????
Does it have input adjustments???
There are 2 books I recommend to every one:
The Mixing Engineer's Handbook
by Bobby Owsinski "
Mastering Audio: The Art and the Science
by Bob Katz "
This is the best education anyone can get for under $100.00 USD