I'm pleased with her so far, goes up and down pretty evenly and no dramas with the WTC. Sits pretty much bang on the intended waterline ( video ) which is pretty high on the Russiian doubled hull boats, with just a 500ml ballast tank. If anything I may add some more foam and lead to increase her metacentric height as I fear she'll torque roll when I fit the prop and open her up.
and video
YouTube - Akula K-157 Bath Test