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I had a similar problem on my LS6 swapped Porsche 944, the starter would not turn after the car reached its full temperature then sat for a few minutes, if I drove the car hot then restarted it, it would start right up. Since you are seeing a power drain, power is getting to the starter, it sucking almost all available amps.
My issue was related to the close proximity of my starter to the exhaust headers and the stock starter could not handle the heat, I think it was heat soak why it would not turn once the car sat for a few minutes.
I replaced the stock starter with a high torque gear reduction starter and the problem went away, I also use a high torque starter the 352 in my Cobra.
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