Plus you are saying that there is 'residual' water in your engine....wrong.
WMI isn't used from 0 to 100, you use a management system and only begin injection at a determined threshold.
For me [and from memory] it starts at 8psi then ramps up until it is all in by 14psi......and/or say 50% IDC and all in by say 80% IDC.
So when you are on a trip and you boost, injection begins. But when you are cruising up your street and parking in your garage etc there is no WMI injected because you are driving well below [or should be] your thresholds. This means you burn off any residual [if you have any] and also allows the motor time to 'dry out'.
BTW if you are getting residual at all, then you haven't set the system up properly - you are over injecting. ie an injector nozzle that is too big for the engine, or thresholds that are way too low to be effective.
I have never had milky oil, my spark plugs aren't rusty wrecks, my bore and valve heads [when using my endoscope on the phone] are clean. I've been using a 50/50 mix for probably 10 years now...all the bad things should have happened by now if you believe the doomsayers. But nothing.
And you don't really need separate injectors etc, just one - KISS. The swirl of the air inducted through the inlet is all you need for an even distribution if you position your nozzle correctly. Maybe for a drag or time attack etc you will see minute gains, but for the street...forget it.
I have no access to E85, hence the WMI.
And the final word...my WMI system works, it lowers temps, allowing more of everything.