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poor starting when hot

Electrical and Electronic

Model: 996 C2, Year:1999, Mileage:136000, Type of use:Street use only
Hello, my '99 996 purchased used in 2002 would always stuggle to start (starter engages but turns 1 second and stops) when the engine been run up to hot/normal temperature. When I cycle the egnition/clutch the 2nd or 3rd attempt will start the engine but starter turns slowly like the battery is low. Problem especially worse on hot summer days. Never a problem in morning from cold start. Battery (2x) and Starter (1x) have been replaced without fix to issue. I have checked the battery cable connections at both ends, all original equip and good. I have check the stop and running voltage on the battery. 12.65V stopped and 13.25V running. Is this LOW for the voltage regulator? In my american car experience regulators run/charge up to 14V. Can the battery cable/line loss must also be contritubing to the poor or weak voltage and resulting poor torque from the starter motor? Is there anything I can try, like an adjustment to raise the voltage regulation level to overcome this low torque condition?Cheers, Robert

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