Hi, there’s not much else you can do to ensure you get royalties from here. I’ll be interested to see if anything comes up on my april prs statement. The only way royalties will come through is if the program maker using your track fills in your name and track name on a cue sheet (which they are required to do, I believe). It can take a long time between a tv being aired and receiving royalties for it, especially if it’s in a different country.
One thing you can do is go on to tunesat.com where you upload your music, and it can detect anytime the music is aired on tv (bigger tv channels only, i think). I have a free account on tunesat (up to 50 tracks) and it has detected a few uses of my audiojungle tracks. If you don’t get royalties paid for the uses you see on tunesat, you could contact prs and tell them about them.
A publisher isn’t necessary for audiojungle stuff. In the stock music world, publishing companies tend to be set up by music libraries as the method of getting their percentage of your royalties. Audiojungle don’t claim any of our royalties so no need to have a publisher.
disclaimer: i’m no expert on all of this, so take my advice with a pinch of salt