Hi, Ode,

Thanks for focusing in on the stabilization period. A lot
of information may be lurking in these phenomena that
can be measured without additional instrumentation.
I'm thinking especially of the 1/e time constant of the
stabilization process. It could be measured with just a
record of conductivity or current (at constant voltage)
versus clock time. 
This 1/e time should be a characteristic of the brew
and the brewing process, not  the vessel geometry
or batch size. And it may change depending on if and
when h2o2 is added, telling us something about the
reaction kinetics between EIS and h2o2.
Just a thought.

Best regards,

Matthew