Why are moves in FCPX so awful?

Question

I can't believe how silly making moves on graphics and whatnot in FCPX is. What happend to handles and being able to ease in/out the way you want instead having some default end-eases that make your moves look ridiculous.
Everytime I make a move and it isn't a straight horiz or vert. direction I get some goofball "S"curve sort of tracking with the element I'm moving. The move that prompted me to write this really took the cake. I wanted a chart to slide into the frame alongside a talking head. I wanted it to sit there for some seconds and then zoom in to a particular line on that chart while still leaving the subject visible. So I put a keyframe with the chart off-frame, a keyframe when it reached the end of its right-left slide, I advanced the timelineindicator up a few frames, added a keyframe there so it held position and then I went to the point where I wanted the zoom to end and enlarged/positioned the chart as I wanted it to end. But what I got was the chart sliding in and stopping as I designed it, but after the pause it BACKED UP several pixels in the OPPOSITE direction it was supposed to and THEN went in the direction I keyed for. And just before it reached its endpoint it stopped and slightly enlarged as though it were moving towards the viewer. Insane!
Am I missing something or is there no better control over these moves? Because this is prettty unacceptable. And the infuriatingly named "Ken Burns" move I find untenable (and not because of the appelation)

Answer 1

Well gentlemen. Here's one for the "How on earth did they figure THAT out?" file.
Since I hit my dead end here I went searching for other answers to this vexing problem. I ran across one in another forum that sounded so implausible that I wasn't going to even test it. But FCP was open and my event active I figured I might as well.
The person who supplied said remedy described it thusly: go to the first offending keyframe and tap the forward arrow key a few times to get just beyond that point (I went 3 frames). Go to the viewer window and select a new keyframe for that point. WIthout doing anything else DEselect that new keyframe. Repeat this at the very same point a few times (again, three for me). After that, advance to the next offending keyframe and then tap the backwards arrow key to retreat several frames from it (again, I did three). Once there, repeat the on/off precedure with the add keyframe button.
I went back to before that motion clip and hit the space bar. The video played and the motion graphic performed perfectly! No s-curve. I find this totally bizarre but who am I to argue with results? Any idea why this would have worked?