Quote Originally Posted by markbarendt View Post
As much as possible I want to use the flash just to brighten the subject "enough".
Exactly. I would set the meter at double the box speed, in this case 800, take an incident reading with the flash meter, and open the aperture 1/2 stop more than what the meter says for the shutter speed you've selected. This should give you nice even lighting without overexposing.