Going by what has worked in the past, the vst’s are in the right place: library/audio/plugins/vst
I thought Kontakt was already whitelisted in 1.1; any chance of a permission problem?
According to the Version History document for 1.1 (page 30):
If you want to whitelist any VST 2.x plug-ins that are not included on the default whitelist, you should place your own vst2whitelist.txt file here:
Secondly, the vst2whitelist.txt file now need contain only the filename of the VST plug-in to be whitelisted, minus its file extension (.dll on Windows and .vst on Mac), with the name of each plug-in on its own line in the text file.