Going from the stock caps to Sonicaps, the sound became less colored, but also a bit leaner and harder sounding. When Fred changed the Sonicaps to the V-Caps, he also did the autoformer volume control. Since I can't say what each would do individually, as a whole the sound became more organic, smoother, transparent, just really better. It's the equivalent to looking out of a window, then opening the window and removing that layer of glass.
Fred hasn't updated his site for long time, but he's still active. He just updated my Circa phono stage. Since he does lots of custom work he may even have other suggestions.