I’ve got a similar setup running myself, though not with Filebot (internal handling of couchpotato/Sickrage).
When I use hardlinks there (at least in Couchpotato) I notice that every reboot causes the hardlinks to be ‘rechecked’. Caused a lot of extra bandwidth on my system; since it will just read every movie from ACD.
Do you notice something similar?
Can your setup also deal with better versions or propers? Since I mounted my ACD folder read-only in a unionfuse folder (together with the local folder, where everything is stored pre-rclonejob), I’ve got issues that Sickrage can download the better version, but cannot delete the file anymore once it has been uploaded to ACD.
Another question: do you use ENCFS of crypt?