It is probably still just a "heat soak" problem.
My suggestion: get a hi-torque mini statrter. If you are concerned about originality, do the following:
1. Get a re-built AC Delco starter with heavier windings (PY has them), along with a solenoid with a heavier spring.
2. Get a therma tec wrap for the starter. The bolt on heat shield doesn't cut it.
3. Get heavier battery cables.
These are typical symptoms of hot start problems.
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