Did you figure it out in the end? I am also looking for protocols to transfect vectors into various human cell lines using Amaxa nucleofector. Some of my cell lines are not in Amaxa database so I am looking for ways to do away with their kits.
You can check out the buffers listed in our paper: Efficient, Low-Cost Nucleofection of Passaged Chondrocytes. The buffer listed 1M worked on passaged chondrocytes. But the other listed buffers may work for other cell types.