closing the case on the sponge- seems to work fine for now to have even ones. not going to use my sin function anymore, much like erf and I can tease erf into that shape if i want. started an erf function dw that had a margin against the wall in case the issue was that i had flow at the boundary (as well as a version that stops early in case). after writing transport script, noticed that transport of dwbc is too large, did a few weakening case studies, including with the gs.