Replace Silver interconnect cable , please advice

Sorry but the problem is the speakers. The Electra are too narrow sounding and slow. The CDP is not the best one also for dynamics.
Anyway it's easier to try a new cable. Try ANALYSIS PLUS SOLO CRYSTAL OVAL.

@Pelo911 : I agree with Lowrider57. Even if i think your speakers is a limitation, you should try to optimize your system before changing anything. An optimization is always a good thing to do because, even if you change your speakers afterward, you'll always keep your optimization! Furniture is a good start. www.hifiracks.co.uk is one of the best gear i heard to date for isolate electronics's vibrations. Try to move your speakers in the room to test acoustic problems.
My recommendation for speakers is always the same : USHER AUDIO. Best speakers for the money, period...

As a good DAC, you can try Mytek DSD DAC. Not expensive, handle HD tracks and very nice and musical. W4S DACII is also a great deal for small money!

For me, changing Focal for...bigger Focal is a mistake.

If you can, try a pair of Usher Audio CP-777. Even in a bad acoustic, those speakers are stunning. The Diamond DMD tweeter is way superior than the Focal's BE tweeter driver and the Appolito configuration assure a perfect phase. So you'll get a better image and sharp and smooth highs. The low register is also amazing. You'll not need a subwoofer with the CP-777...
The finish is also great and you'll save a lot of money in the process to invest in better wires.