
If something comes in way too loud then I turn it down, if it is way too quiet, I turn it up - no big deal. Some people obsess over the transparency of gain calculations, and ok, I have done a small amount of testing in the past, but in the real world I have work to be getting on with...
But aside from all that, while you don't seem to have any problems understanding the required format/level etc for submitting stuff, you'd be AMAZED how many people do. I get stuff clipped to bollix, down at -30dBFS, you name it... So it's worth reiterating the -3 to -6 thing to try to make life a bit easier...