Are you sure those are SLS prints? I have hard time believing they are. SLS prints shouldn't have those pronounced textured lines or need supports to print. Two of the biggest benefits of SLS is not needing supports and very fast printing lead time. I don't understand the melting away process either and why it's needed. Those look like FDM prints with linear infill. I'm sorry but if you are paying for SLS, your prints should come out solid without tiny holes light can shine through.