> I recently browsed the same feed on mobile ... and it was entirely different! I think I spent a half hour and saw zero content from my follows

At the top of the mobile app there’s a “For You” tab and a “Following” tab. You must have been on the “For You” tab.

Switch to the “Following” tab.

If you start scrolling the “For You” tab and do it for half an hour straight, you’re basically signaling that this the content you wanted to see and will continue getting more of it.