You could produce more than 1g per Watt, but it's going to be dependent on several factors. I.e. - your overall experience with growing, your experience (and understanding) of the strain you'll be working with, proper application of the nutrients you'll be using, climate control, CO2, etc.

Also, vegging for 2 weeks could diminish yield, unless the plants are insanely supplemented with everything mentioned above, and more. Is height a contributing factor in why you're vegging for so little time? You could consider LST and letting them veg for a little while longer, which could easily produce more bud sites.