Where did you hear the Evo 30's that had a lot of untight bass?
I have no idea of what set up they were in or where you heard them, but it must have been a shabby setup or suffered from poor room acoustics.
The Evo 30's bass is typically what ever is on the recording, if you have gear that does bass correctly. There is a slight warmth or richness to the bass; but it's thight and solid. At least in the set up I have mine in.
As well in several other setups I have heard the Evo 30 in.
As for highly revealing, no, the Evo 30 are not highly revealing. But they do have nice musical detail without being analytical, harsh or fatiguing.
They are not exactly lacking in detail. Just not overly-revealing. Which makes listening to less quality recordings or masterings, a very nice, musical, pleasant experience.
If you already have the Evo 30 in your home, you may want to work on speaker placement/setup and take a good look at the components your feeding them with, as well as room acoustics; before making a change.
I have had the Wharfedale Opus 2 floorstanders in my main two channel/HT system for five years, now. The Opus series in general are a little more revealing than the Evo series. But still not analytical. They remain musical and pleasantly listenable for long hours.
The bass on the Opus 1 is a little bigger......more prominent.... than the Evo 30. Larger driver. Depending on what gear you have, it may or may not be a night and day difference. But Noticable.
The Opus 1 uses that three inch dome midrange ( an awesome driver), which utilizes a loaded horn design. So the midrange detail will be a bit obvious and larger, too. Yet smooth and sweet with the right gear.
A lot will depend on the components you use to feed them the music, the music/recordings themselves, room acoustics and speaker placement.
Best thing to do, if you can, is audition these speakers and decide for yourself which sound you like the best.
