Hi Rolf,
I'm assuming you have listened to Acker on Youtube. There are many nuances he puts in such as changing tremolo and sliding up to pitch rather than keying all notes in separately which would involve a keyboard player being continually on the mod wheel! However those features can be worked on later if felt to be needed and if possible on the s700.
Two things come to mind listening to the basic clarinet sound in your post.
1. Your post is in the key of F and the octave used is on the high side for the main part of the song. IMO the octave should be one lower, and in this range the Jazzclarinet is capable of producing richer, more chocolatey tones, which you should find closer to Acker, provided it is suitably adjusted and played.
Acker's video plays primarily in Bflat. If you want to emulate this while continuing to physically play in F raise the keyboard transpose by 5 (after reducing the clarinet octave). When you get to the Bridge in the song, then go up an octave as in the original.
2. The attack on each note played is very noticeable to my ears which detracts from the overall effect. Did you set the attack to 8 as suggested in my previous post? This needs to be combined with a playing technique that is more legato (laid back!) to encourage one note to pass to the next smoothly without the sudden off/ on of more staccato playing (more typical I believe of a classically played instrument). On the s700 attack values of higher than 8 may be needed so be prepared to experiment with the values and technique. (Higher values slow the attack which you will readily find if you go too far).
You might find a reduction in tempo (say to Acker's) helps to achieve this while experimenting.
Also you may wish to experiment with other edits I mentioned before which help to improve the tone, as you progress
.
John