RE: 8s Charge Setup
Should it not be possible to obtain 1 X 8S XH connector and 2 X 4 XH connectors (Assuming they are XH and not EH or even some more exotic balance connector) and take the first four wires from your 8S plug to your Nr 1 XH Lipo connector and the next four wires to your Nr2 XH Lipo connector? The batteries can remain connected in series and the batteris charged and balanced with no problems.