[Big-Foot]

Hmmm...

I've helped a couple of cars get past this kind of issue by just cleaning up the electrical system - sounds like you've already covered those bases..

There are other hot-start gotchas as well..

* Valve clearance hot is too tight. Not enough compression to get them to light off at normal cranking speeds..

* The age old vapor lock in the fuel pump - normal cranking speed is not fast enough to push the air out of the pump and start moving fuel. I'm sure you've got that covered too with an electric pump.

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Back to starters for a minute..

It's my experience that the gear reduction starters don't really spin the engine over any faster than the standard direct drive starters - just that they draw less current.

If you put a booster-pack on your car when it's hot, and it starts, you may have a lack of amp hour capacity in the battery.. Even if the car is spinning over quickly - try putting a booster pack on as well and just see if it makes a difference..