Re: Why does this happen with ti plates?
Racking with Ti I haven't seen any differences electrically. Going by the info you give, I have a possibility.
For a 6 ASF, a 15V peak +-4V is normal. The lower voltage you get with alum. rack could be from a high conductivity of the alum plate due to it's size and/or grade. This is providing that the other parameters are fairly consistent.
If I were in your shoes I would drop the CD down to 4.5 ASF and give it a try. It'll give you a calculated peak voltage of 11.25V and still have room for resistance in the circuit before maxing out your PS. I know it'll take longer but it may answer some questions.
Do most of your runs usually have about the same peak voltage without the racking?
SS
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