I'll second all that Plato said, and add my experience.
As an owner of IRS Beta's, I feel your pain.
Your room: Is it well treated? These speakers like a BIG room to sound their best, otherwise, you'll need to turn down the crossover controls to or near to their minimum points. My Beta's are in a room 16 feet by 19 feet. I use solid state, Levinson amps with the Betas, and my mid, lower and upper tweeter controls are just off the lowest setting on the crossover.
Tube amplification: I am not entirely familiar with the Omega, can you biamp them? If so, borrow a good tube amp from your friend, a dealer, whatever and try it on the mid/tweeter side. This may make a world of difference.
I use a Levinson 333 on the mids/tweets of my Betas. This amp was known for a darker, subdued sound, even so, it's still not as good as tubes would be!
Your other equipment: Your Omegas will show flaws in cableing, harshness in your CD player, and ALL the flaws Redbook CD's can have, however on/with good sources/components, very little that's currently available at any price will outdo your Omegas.
Hope this helps!