My next goal is to get users to reduce their relay lists from an average of 20 to 3. 

You don't need to trust 20 relays. You just need 1. But 3 adds redundancy in case 2 of them are busy at the same time.

And remember: Relays can see what you are looking at in real time because the app is requesting the post, likes and replies from them as you scroll. They can even count which posts captured more of your attention. 

So, make sure you trust your relay operators.

GM.