It sounds to me like the fuel delivery isn't adequate, hence it will rev out on light load (eliminating crank trigger problems etc)
Under load you have increased fuel quantity demand and current demand for the coil and injectors, so that's what you need to be looking at.
You can watch what the battery voltage does in live data, or put a multi meter on the coil feed and see that it stays >12v.
For me though it's most likely that the fuel delivery is inadequate, because you get the same symptoms. Misfiring after the cutout is probably because it has suffered 'rail drain' and basically aerated what's in the fuel rail. You can put a pressure gauge on the rail directly. It needs to hold 3 bar at full load and high revs.
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