sac for bow of 205v x star

Hey guys was wondering what you most of you use for a bow sack or something in the floor? The more I mess with my set up the more I realize I need more weight in front. I currently have 400lbs in lead in the front, KGB and cannot fill the 750s in the back full so only fill them to the level of what the old 450s were. The boat wont plane with them full and that current weight set up and most of us ride between 20 and 22 not 24 and above. Any suggestions would be great. Yes I have already re-propped