Two fatsacs on the same side of the boat?

I just got a CWB Ride yesterday and I was out riding it with a 600lb sac on the side and a 1200lb fatseat at the back filled. At no point was I able to feel the strain coming off the rope and I tried everything leaning forward on the board until the nose went under, driving anywhere from 9-15 mph, driving in circles, driving straight.

After looking at some of the wakesurfing videos posted in here I can tell I need a LOT bigger wake. The boat is a sportstar 19 and I'm not sure how wise it would be to put another 600lb sack on one side, does anyone else do this?