I understand,
I have kind of the same issue with Hikashop.
Hikashop generates its own og:tags, but only for product pages (or at least, category pages have issues).
I had to disable JFBConnect for Hikashop, otherwise og:tags generated by Hikashop wouldn't work, but this way I can't add custom tags to category pages via JFBConnect...
the only option would be to completely disable Hikashop own tags and customize all my shop templates to add JFBConnect tags, but I'd prefer to not go so deep.
I suspect something similar may be happening for many other components out there, maybe people dont' report it because they do not care enough about correct open graphs.
So... in the end I guess this is a feture request for you to try to solve this issue on your side, it would be a great addon to an already great extension