New drum seal and the high temp adhesive solved the problem! The seal was tight, so tight it wouldn't go all the way around the drum. After a bit of a stretch, it fit perfectly. A bit of advice for anyone who might read this, dry fit the seal onto the drum BEFORE using the adhesive. Otherwise, you'll just make a mess. I had some small binder clips on hand to be my third, fourth,... and tenth hand in holding the seal in place while I fitted it all the way around. Dryer is running smoothly and the drum is quiet again!