It's often a difficult problem to diagnose, this difficult hot re-start/starter heat soak thing. It only takes one header tube close enough to the starter to swell up the internals just enough to lock the thing up and make the engine difficult, if not near impossible to turn over after a hot shut-down. I've seen this happen many times as factory starters run pretty close tolerances and a little wear at the bushings moves things even closer together. When this happens one really doesn't know if the starter is just getting weak, or if the heat is making it act that way.
One thing to check for certain is base timing. Some engines do NOT like much initial timing and will "buck" the starter pretty hard when they are well heat soak, which mimics a bad starter, weak battery, bad connections, bad cables, etc Using lower octane than the engine likes will do exactly the same thing. It will crank effortlessly cold, but much slower warmed up and may even "buck" or "kick-back" under certain conditions when things are fully heat soaked.
My own engine is a classic example of this. It will run fine most of the year on 87 octane, but in the hottest summer months when well heat soaked once in a while it will either "run-on" after shut down or crank slow or even "buck" the starter.........Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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