Crown, Boston, and Blue Stars all had great drumlines this past summer, especially relative to where the corps has been placing the past few years. Not sure I'd say their percussion sections need improvement necessarily.
I love The Cadets, but I agree the past few years they haven't been the most consistent drumline on the move. That includes the year that I marched there, so no hating, just what I think is true.
As a preemptive note, I hope The Bluecoats drumline retains the quality they've developed over the past few years. With almost an entire new staff and not that many vets, it'll be difficult. That said, that staff is friggin stacked, so I'm sure they'll be incredible. I can't wait to see 'em.
Peace!
-chris