Help, My Vandies Sizzle

Hello All, first time posting here, but have enjoyed reading all the posts for several years.
Recently purchased a pair of used Vandersteen 2Cs listed here on A-gon from a great dealer in Hollywood, Florida.
They replaced a pair of Monitor Audio Silver RX8s a few months ago.
 Dedicated listening room with a dedicated 20A circuit, 14x14x8, wood floors over concrete slab, alcoves and bi-fold closet doors allow for some respite from the dreaded "square-room bass boom", heavy area rug covers most of the wood floor, a couple of upholstered cloth recliners, and artificial trees on sidewalls at first reflection points and at front wall between speakers.
Speakers are positioned 7 feet apart, no toe-in, 2 feet from front wall, 3.5 feet from sidewalls, listening chair is 10 feet from speakers. (All measurements measured from tweeters).
Gear is Oppo 103, Krell s300i (integrated). Cables are Anticables.                                                                                   
The problem is a slightly bright sound on most discs, with a definitely hot treble on some, bordering on un-listenable.
Using the mid and treble controls, have tried reducing them by 3 dB. That helped some.
Otherwise, love, love, love these 2Cs.
Not interested in getting back into vinyl.
Will consider any and all suggestions and thank you all in advance for so much good information.

Tom