Everglide Jade
The correct answer to your question is Zealio V1. But since that is unavailable, Everglide Jade. They're noisy out-of-box, but with lube they actually sound good.
They are designed as a nicer version of MX Brown, with smoother operation and a slightly sharper bump. [The original Zealio V1 was kind of meant to be in-between Brown and Clear, I think.]
They are definitely smoother than many Ergo Clears.
I have a board with Everglide Jades [lubed with 3204 and springs lubed] and it is magical. Essentially a very smooth linear with a bump in the middle. Just enough to let you know you've actuated the switch.
However, you may be more interested in the upcoming RARA V2 and Shogoki switches, which are in GB here. Maybe it's not too late. They use the same stem as Everglide Jades, I think [the RARA stem]. However, they may be in more tactile housings, and they are using heavier [middle-weight] springs.
They may be the ideal solution for your question.
Silent Sky Boba
You can also throw in Silent Sky / Silent Forest stems into the Boba housing, and you'll supposedly get something resembling MX Clear tactility, but at a lighter weight. You're supposed to use 68 G springs for this, I think. Maybe you can even use MX Clear stems.
Ergo Clear
Of course, the classic answer to your question is the Ergo Clear. It's a lubed MX Clear with a lighter spring. MX Clear uses a conventional Cherry tactility of having the 'bump' in the middle of the keypress, but the spring weight is reduced compared to the stock switch.
There are many ways to make an Ergo Clear. You can get a fairly smooth and snappy [businesslike] Ergo Clear using 3204 lube and a 60 G TX spring. They function well and are light and punctual.
Or you can use a 65 G TX spring and 205g0. It's a heavier but softer feel.
You can back off on the lubrication somewhat by using a heavier 67-68 G spring, but I don't have a lot of experience with this. I have tried Ergo Clears at 63.5 G, and they feel like crunchy Browns [slightly heavier and more tactile].
Overall, Ergo Clears tend to be more tactile and 'noisy' in feel than Zealio V1 and Everglide Jade. It's a matter of preference what you like better. The Zealio V1 and Everglide switches are more 'linear' as compared with the Ergo Clears, which are more granular.
Aliaz
Aliaz wants to be a serious tactile switch, but it's mostly designed like a Gateron Silent Brown.
You're right that the spring is the weakest point. They really are noisy. However, replacing the springs can yield good results.
I found that the 65 TX in Aliaz is great for gaming, which isn't why I was building it, but I haven't made enough switches to properly test them for typing.
Aliaz is the least tactile option here. The real reason I don't type on Aliaz is that, even with a good spring, I find that the actuation point is too low, lower than the Cherry-style and clones that I am used to. I miss keystrokes by releasing the switch too early.
SP Star
The SP Star sounds really interesting, and I am going to be picking up some samples one way or another. I think they are mainly T1 clones, but maybe we are lucky and there is a RARA stem in there or something. Some Leopolds are shipping with them as a stock option.
Hako Clears were also mentioned here, and it reminds me that you might want to take a look at Hako Violet. They kind of remind me of light Ergo Clears, like my 60 G. They are a bit sharper than I would like, kind of a harsh no-nonsense switch, but they kind of fit the bill for what you are asking. Don't mount GMK on them, though.