Midship has always made the most difference for me, in both boats we've added a gate style setup. Don't be afraid to try less ballast too -- I know that sounds weird, but with SG it's not always the most ballast that makes the best wave (it is with tabs though). If you have great success with mid ballast, or more in the bow etc, then lead ballast comes in to play if you want to hide it. I've got 500 lbs hidden.... yup, got creative.
Awesome project.