I've got Kestrel Hot Rods, too, and defintely never had a problem with the highs. It almost sounds like you forgot to hook up the tweeter terminals or lost a connection. If you are not bi-wiring, the best configuration is to run the amp to the woofer posts and jumpers to the tweeter posts. If that checks out, you may have a damaged tweeter or bad internal connection.
Important Info for Meadowlark Owners
I don't see my post under 'Meadowlark kestrels' and maybe I'm the last one to find out, but, I've found that the sloping baffle of the Kestrels'makes them an entirely different speaker with my ears way up at 48 to 50 inches off the floor. Gorgeous soundstage, tonal purity, amazing detail without any high frequency nastiness. Ratchet up your chair and hear them for the first time.