OP, I know exactly what you've been experiencing. Same here, and I could not find an easy solution.

I've learned driving on a manual, and have been driving manuals all my life. I can shift perfectly smooth on a Civic, a Fiat, or even a Lada Samara (!)...

Shifting smooth is easy if the friction zone is long enough. Not so with the S. Clutch engagement is rather abrupt. It gets better with practice, but once in a while I get that jerky shift. Not much I can do about it. I don't care anymore. I just drive as I like. Trying hard for the perfect shift every time can ruin the fun. I just make sure that I don't ride the clutch.

After reading many threads on this, my understanding is that most people experience the same issue. They either know about it or not. Some will post that it's definitely you, not the car. Well, there's not much you can do about them either

 

I just changed my clutch, I had the same problem. Most machanics here in my country not familiar with s2k, so I did search here everytime I needed help and had them done by myself. Use the search function, very useful.
This can solve your problem:

https://www.s2ki.com/forums/index.php?showt...0&#entry5234269

The images are removed, you may ask the poster to email or pm you the original images, very clear.

 

Albeit a bit late, here is my take on learning a clutch.
The key is that approximately 90% of the pedal travel is only that, just linkage movement. Somewhere in the 10% rest of the travel the clutch will go from totally out to fully in. You have to find that engagement point or "Clutch Point". On the S it is almost at the full height above the floor and can't be adjusted much. If it has drifted down toward the floor then you might have to look into replacing the clutch hydraulic cylinder because it is goofy.

The S clutch point works very well for speed shifts and here is how to find the clutch point when you are learning. Best if first tried in a parking lot in first gear.
1. Take the stopped car and use the gas to give it around 2-3000 rpm and hold that engine speed (the gas pedal can be held quite well by resting the side of your foot against the transmission tunnel). I taught my kids to do the clutch by jamming a shim in the engine accelerator linkage to hold the engine speed so they didn't have to worry about the gas while learning the clutch point.
2. With the clutch fully to the floor, 1st gear, slowly release the pedal until you feel the car start to move a bit(this is the start of the clutch point).
3. Push the pedal down again and find that same clutch action point again. Repeat this until you have this point memorized well.
4. From now on you can release the pedal rapidly up to just below the clutch point and push back down if you want.
5. Now with a fixed engine speed bring the clutch pedal up to the clutch point and then release s-l-o-w-l-y so the engine speed just drops and keep very, very slowly letting up until the car starts rolling. When the engine speed stays constant and you are rolling then you have likely engaged the clutch fully and can take your foot off
the clutch and the car will keep going a steady speed.
6. Practice this until you can get the car rolling easily, without dropping the engine speed much (500 rpm or less).
7. You now know where the magic clutch point is and its easy to duplicate.
8. You can then practice speeding up, shifting, then quickly bringing the pedal up to the clutch point and engaging it in the new gear.

That is about all there is to know when using the clutch.

For better shifts all you have to do is the clutch point trick in first gear,then let the clutch out all the way, accelerate with the gas then push the clutch pedal down only to reach just below the clutch point, shift to the next gear , etc, etc. All this is done around the clutch point without pushing the pedal all the way down.
- - the key here is that you do not have to push the pedal all the way to the floor to shift only to just below the clutch point then back up again when in the next gear.

Shifting gets quick when you only have to push the clutch pedal down 30% or so then back up when in the next gear.

Good luck, Gene