Your main issue is relying on Pore being feature complete, of which it is not (just search on the forums and github repo and you’ll see what I mean). Unfortunately, a majority of Bukkit plugins will simply never work the way they’re supposed to, especially if they’re updated for features added in 1.8/1.9. Your best bet is to start porting data across to sponge related plugins specifically.
There are quite a few plugins that have been ported already or written by the developers in the sponge community to replicate some of the functionality. As time progresses, there will certainly be more plugins written for sponge.