I know you do a lot of big, high dollar efi builds, but I don't agree with what you said about the injector drivers. Everything I have ever read on the 80% rule is not for keeping a driver from "overloading", I've never seen or heard of this, other than when someone tries to use peak and hold injectors on a saturated injector driver circuit. The 80% rule is for fuel control, above about 80% until you reach 100%, it is very difficult to properly control the fuel flow as the mechanical movement of the pintle itself cannot go from fully open to fully closed in the amount of time given when the injector is pulsing at over 80% D/C. This causes the pintle to begin to close but before it can is already opening again, causing inconsistent fuel control. Inconsistent fuel control is the last thing you want to happen when at 80% D/C as you are likely at peak power, when engine damage can occur if a lean condition occurs.
I have seen a couple of issues that have occurred where a driver went 100% D/C on an entire bank of injectors when the ignition was turned on (not running obviously). The injectors got smokin hot after a significant amount of time at 100% D/C with NO fuel flowing, and yet there was no injector damage or driver damage caused. I've also seen random failures to injectors drivers, but none that were proven to be caused by duty cycle.
I say all these things because I am curious why you say that over 80% duty will damage the driver? Have you seen these failures before that were traced to D/C? Were they isolated to a specific ECU brand? Was it with saturated or peak and hold injector circuits? I'd just like to hear you expand on your info.