Obviously I would love to have some tanks, but at this point 1 pounders would be a huge upgrade. My goal would be to consistently catch 2-3.5 lb with the occasional larger fish, while still having fun BG to catch.
You should be able to get an expert to chime in, not just a hack like me, but here goes:
To get big bass, my advice would be to remove every single LMB shorter than 14", add cover, and stock large adult BG. You really need the additional reproductive capacity that BG have in comparison to GSF to have enough forage to go around. We've had a lot of success following this strategy in our 2.2 ac pond.