Your weak point is your loudspeakers. The Klipsch RF8000s are OK but you can do better. I’d keep the Vincent, it’s a nice unit. Start shopping for something that sounds good to you. Upgrading your electronics won’t get you much for your money.
^^^this.
I would not dump that Vincent til the rest of the system catches up, and even then be really certain before you let it go. You could always roll some different tubes to vary the sound a bit. Danny Richie from GR Research might have some mods for your Klipsch. Or you might consider upgrading the crossover parts if you don’t want to to change speakers completely.
Any thoughts on what you specifically want to be different in your system?