UPDATE: No, it doesn't. It worked properly on 4.40 though.

Congratulations on solving.

Regarding lowering voltage, I recall voltage swing, i.e. how fast the voltage jump from digital 1 to digital 0, theoretically we want instant 90 degrees swing, but that's not in reality, there's a time hence a very steep slope/angle.

The higher the voltage, the more it has to travel, the longer it takes to complete the change state. That's why we have latency in built, sort of to let it settle clean no bad trailing effects, etc etc jargons I don't know about. 

That's why lower and lower voltages for all sorts of electronics signal processes are exercise. 

A funny rememberance was the AMD Athlon year 2000 ??? there about require overclock the CPU from default voltage 1.5 I think drop to 1.2 and success from 1Ghz to 1.4Ghz crazy concept.

These things a live man......... but congratulations another one going to be very happy customer.

A few words about re-keying-in the same numbers work in later day..... for my case, I use the calculator then key in everything but fails immediately F9 beep warning. Then I realize don't key in all at once, just use a previously bootable timings, then key in one at a time and reboot, rinse and repeat. 

Along the way I could have swear I used those parameters before, but didn't work, either quick death F9 beep beep, or partial POST Dr.Debug numbers stop half way, but after some time it would accept the new timing, something like that anyway.