IMovie 11 with chroma-key and watermarks

I'm new to iMovie. I did attempt to find the answers to the questions below here and on the web. Frankly iMovie so far seems to be pain....
setup for my testing purposes only:
a) borrowed chroma-key movie from the web
b) borrowed m4p from the web
I wanted to test my ability to use chrome-key and watermarks in making a short clip using 3 products...Screenflow 4, iMovie, Final Cut Pro X.
Questions and/or statements:
1) Green-screen:
Screenflow and Final Cut took about 5-10 minutes with zero knowledge of either...Over an hour with with iMovie and never could make it work.
2) Watermark:
Aganin 5-10 minutes with Screenflow and Final Cut, with iMove it looks like I could have either keying or watermark, but not both.
Screenflow is SUPER simple and cheep (on sale today for $70), I've seem it 50% off...
Final Cut is OUTSTANDING but super costly for what I wanted to do....Really a great product.
Anyway, here I am with a iMovie and so far it looks like it isn't a fit for me...Anyone know if a way to tweek it to make both chroma-key and watermarking work? I guessing it's just me, but the others seemed so simple.
Attached are screen copies of each...in order below are iMovie, Final Cut Pro X, and the output of Screenflow....
I want to thank those that I borrowed these images from...I will not use them beyond my testing....
Thanks for any helpfull hints...

iMovie is designed with a very forgiving green screen feature so you can hang a green bedsheet on a wall and get a decent effect. It is designed for people making home movies. Perhaps for this reason, if you have a perfect green key in iMovie, then iMovie might think you used the green on purpose. It expects some variation. When people are doing computer generated graphics, or creating a green background with Photoshop or Keynote or Powerpoint, I suggest using a gradient between close shades of green, rather than a monochromatic green.
If you need sophisticated control of your keying, get FCPX. I am not familiar with Screenflow.
Also, iMovie does all rendering in one pass. This means it cannot do effects that require a render on top of a render. Say you want a greenscreen effect with a watermark on top. That is two renders. This is easy in Final Cut Pro, but not possible in iMovie without jumping through some hoops.
Also for this reason, longer movies should be done in FCPX. What for iMovie would be an immense job requiring huge resources, FCPX can do by chopping it up into bitesize pieces.

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