At the moment, the original Ibex servers are probably faster than the PCIbex ones, and migrating from one to the other is straightforward if you make your experiment on a git project on GitLab or GitHub: just hit Sync on either Farm and you’ll have your project up and running there.
Compressing all the multimedia files into one zip archive and hosting it on an external server (with a secure domain, which you should already have since you collect audio recordings, but see this page) will definitely help, regardless of where your experiment itself is hosted.
I can’t give an estimate for the server reset because I haven’t scheduled one yet. The whole process usually takes less than an hour. I will post a message on the forums once I schedule the reset.