Bow bags help to make the wave longer. If you have extra peeps, you can make them sit up there.
When I ran my Supra, it was more important to have weight in the middle, center ballast bag with weight on the floor under the windshield. Sometimes I would never fill the bow bag b/c the wave and weight looked good. If I had a lot of weight in the back, sometimes the wave would be too steep and short.
Most of these Supra and Moomba models behaved the same when running suck-gates.
2018 Supra SL400