Doing your own encodes is also really cool. I’m not too sure what the AV1 compatibility of your friends’ players would be, but yes AV1 encodes are a very efficient way to microsize. If you happen to be on PTP, there’s a giant AV1 research thread with people testing stuff out. It looks like they prefer SVT-AV1-PSYEX as of the latest posts, though I don’t know enough to understand which encoding settings are the most impactful.