The startup current theory was mostly speculation.
From what I could find, it is signal timing or voltage ramp up timing issue.
I have a dual 787 and dual 788 sproggy and that does not solve the problem alone. I was able to power the m9000 with my unmodified sproggy 2.7 (dual 787 and single 788) on one occasion. I did it using a BASIC Stamp IC. I used the stamp to control the various signals (Power Good, PS_ON, actual sproggy power on, etc).
I still haven't figured out the exact timing needed. The time I got it to power up, was actually due to a bug in my stamp code, where it was randomly power cycling the stamp chip restarting the startup sequence.
My suggestion is to not waste your time with the sproggy if you want to power an M9000 or M10000. Just buy an Opus, or Magic Power (or wait until may and pickup a cheap 70w from mini-box.com).
The sproggy is still useful for powering other motherboards, harddrives, assessories, etc.