Compact crankset, what a pain...

So I went from a standard crankset to a compact crankset and those mechanics were (and are) having the worst time on the planet trying to get it to work right.  I guess maybe the "jump" is higher or the chain rings are different or something.  Either way the Di2 shifting wasn't happy.  Through a chain a couple of times when trying to go to the small ring then wouldn't make the jump to the big ring.  Then it worked pretty well until I got home then it was having a real hard time making the push to the big ring.  I'm just hoping it was the battery that was just starting to die out a little bit and it isn't something more serious.  At the moment I'm feeling frustrated with either the good folks at Shimano and Cannondale I just don't know which one.  It was working so flawlessly with the regular crankset I might end up going back.  Design flaw somewhere?