Okay -- if I understand what you're saying: you have two machines; you copied over all your FCPX projects from one machine to another. You copied your third party effects -- which **work** in new projects you create on the Air but NOT on the older projects you moved over.
Try this:
On the mini, open your project, find the Smooth Move effects and for each (that aren't working on the other machine) Save Effects Preset (just save the Smooth Moves). Give them each a specific name (SMove-ProjAbbrev-ClipLoc). Save them to a specific category (Alex4D EPs). [If you use time for ClipLoc, do not use colons or periods (unix thing) - use dashes or just format the time in HHMMSSFF.]
Copy the Effects Preset files to:
Users/<username>/Library/Application Support/ProApps/Effects Presets
on the Air.
Find the instance not working on the Air and go into the Alex4D EPs category and drop the corresponding effects preset (you can simply turn off the original until you're ready to delete it). If it works, the EP will load a working copy of Smooth Move on the Air with the saved parameter settings (as well as any keyframing you've done) you had on the older setup. You can then delete the older instance of Smooth Move that isn't working from clip in the Effects inspector.
Normally, you could just add a new working version of Smooth Move to replace the old one, but this Effects Preset method is a way to save and copy/duplicate your parameter settings from the older project versions. If everything is installed correctly, this should work to restore your settings. If your Smooth Move template is exactly where FCPX expects to find it, FCPX will load it and set the parameters by itself. If it fails, then you need to recheck all the installation steps (maybe you have duplicate or *trailing* spaces added to the file path parts that you may not be able to see right off.)
If the Effects Presets trick works, you can simply go back and delete them (then restart FCPX).
If you have any questions, get back... I have a feeling that if you clear up one instance of this problem, then all the rest of them will work out "by themselves".