Ok,
The default install for 32bit SONAR is "c:\program files(x86)\....."
The default install for 64bit SONAR is "c:\program files\...."
They never see each other for any reason including VST scanning. You should have just let the installer pick the default paths. But that is a different matter.
It sounds like the reason CA2A, R-Mix and V-Vocal are not getting picked up is because you have not installed the 64bit versions. You need to go back and perform an advanced install of X2 and the CA2A and use the same path you used for the X3 install. Or better yet, if you did not use the default X3 path, uninstall X3 and reinstall using the defaults (assuming you did not already put X2 32bit in "c:\program files" which is the wrong place for it).