How to get multiple Move A Fixed Distance vi's to work?

OK, I've seen other postings where people didn't have luck with this vi. Hopefully, the debugging I'm working on will help the community in figuring it out. I'm looking start with a really simple FTC autonomous prototype to drive (straight) down the ramp, turn (towards a goal - hopefully we'll have a sensor too), deploy goal grabber, then drive backwards a specific distance and orientation (to the parking zone), then spin to deposit the goal. So, the first challenge was drive forward, turn and back up. This should've been a 30-minute exercise. We probably have dozens of man-hours invested so far - with no luck.
So, I've included a series of vi's:
3movedistance_test doesn't work: it only goes forward; in fact it doesn't go exactly 360 degrees
ditto on 2movedistance_test
1movedistance_test seems to work fine
when I dial down the power on 1movedistance_test to 20%, one motor moves ~360, the other moves ~120
[oops - gonna have to upload the rest of the files separately - only 3 attachments allowed]
3movedistance_parallel - I can dial down the speed to 1, and both motors turn exactly 180 - it looks like they're taking turns though, they individually index about 30 times
That's phase 1 of the research.
Phase 2 was to get the sledgehammer out and skip the Move A Fixed Distance vi, and use the Wait For Rotation vi with a standard Move Motors vi. MoveDistanceJC has the following characteristics:
at 80% power, Motor B goes ~2-1/4 revolutions (obviously greater than 0.1") and Motor C goes 2-1/3 revolutions
at 50% power, Motor B goes ~1-1/4 revolutions and Motor C goes 1-1/3 revolutions
at 20% power, Motor B goes ~1/3 revolution and Motor C also goes 1/3 revolutions
Attachments:
3movedistance_test.vi ‏24 KB
2movedistance_test.vi ‏18 KB
1movedistance_test.vi ‏18 KB

We're apparently not the only ones either:
Mike5027 2014.10.06
Mike5027 2014.10.09
4644Mentor 2012.02.23
robuff 2012.02.24
philbot 20211.05.03
FTC7785 2013.10.21
The vi help is sparse in detail.
These are the only 3 possible workarounds that I could find that got me started on the variation in MoveDistanceJC:
How to calibrate NXT motors to travel the same distance?
LabVIEW example: Motors
FRC704 2011.02.13

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