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Put a fuel pressure gauge on the rail and check the pressure under the conditions when it is hard to start. Possibly the fuel pressure regulator has a leaking diaphragm and it is draining fuel into the intake manifold.
Nissan Z cars were terrible about hot soak restarts. On the later models they put an injector cooling fan to blow air on the injectors, which helped some but never really cured the problem.
Another thing to try would be to clamp off the vacuum line to the regulator when you stop it hot. The unclamp it just before you try a restart.
regards
Mech
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