The ride has gotten progressively worse over the last few months, so I inspected the shocks and associated parts.
Rear bump stop was separated clean in half, and one rear shock does not extend whatsoever upon compression.
Front strut mount to shock nut was extremely loose on one side somehow, so I tightened it down. Loosened and re-tightened the other one as well.
Kind of disappointed the Koni yellows only lasted 2 years (40k mi).