I looked into plumbing the 400s in but it looks like a lot of work. The 900s don’t have ports on the front and the 400s only have one port near the floor at the back. I have 800# of lead already. The boat has about 4600# of ballast currently and surfs great. Just looking to clean up the process a bit and maybe add some more weight at the same time. I am going to reinforce the divider panels and do the vent mod all at the same time. I just keep hearing about these 1400# bags. I’m not sure if a person could even fit 1400# bags in my generation of Mojo (2020). The 900s fill basically the entire corner lockers up tp the top and the 400s take up all the available space under the seats. I suppose another 100# of water doesn’t take up much more room but it would have to truly be a “perfect fit”.