Although I would not figure Nordost to necessarily have good synergy with ceramic and diamond drivers, I do not think that would necessarily limit your bass.
I would focus on the amplification. I personally feel that people vastly underpower their speakers. I'm sure the Vitus has a great 100 watts, but those woofers need real power to have them move air. If you can biamp, try to add-in something with muscle. I'm sure the Coltrane's are a special speaker, but looking at the specs, they are going to need some real experimentation to reach their full potential.
I would focus on the amplification. I personally feel that people vastly underpower their speakers. I'm sure the Vitus has a great 100 watts, but those woofers need real power to have them move air. If you can biamp, try to add-in something with muscle. I'm sure the Coltrane's are a special speaker, but looking at the specs, they are going to need some real experimentation to reach their full potential.