I've found the opposite. Too much tube - particularly if it's a "preamp" type of pedal instead of an "overdrive/distortion" type of pedal - makes things sound muddy and definitely not tight at all. Solid-state into tube actually sounds better. I have a V-Twin and a V-1, and I've tried the Blackstar stuff, and the only one that sounds good into a tube amp is the V-1, which is the simplest and least "preampy". Even that doesn't sound as good as a good solid-state pedal. But they all sound great into a clean solid-state amp...
The best pedal I've found with my Tremoverb (which isn't quite the same as the Rectoverb though) is the Boss SD-1, that really tightens it up and makes it sing. The V-Twin just sounds like a flabby, muddy mess. The V-1 is somewhere in the middle, and is the one that's all-tube, but it still doesn't sound as good as the Boss.
Be aware that the Blackstar isn't all-tube either - it's like the V-Twin, it uses a tube for coloration and maybe a bit of distortion. Most of the actual distortion comes from the solid state bits. Don't let that put you off though, like I said I think solid state into tube can often sound better than tube alone. And a lot of classic recordings were done that way.