Will share my experience and maybe there's something in there that will talk to your senses.
I have the '21 V4S full titanium Akra and my friend the '22 V4 with slip-on. Side by side acceleration he kicks my butt until 10K RPM ... I blame the increase in low end torque on the V4 due to the EURO5 exhaust certification.
Now the V4S's auto-dampening and auto-ride adjustments are definitely an amazing add-on. I couldn't live without them anymore. I had a Monster 1200S and had added a dampener and was constantly adjusting it depending on speed and ride type ... no longer. The self adjusting suspension is un-noticeable until you get on the V4 after, then you realize it was a very good addition.
I also have a friend that has a V2 (one of the first) and while we are cruising and having fun on the highway he has enough power that while revving I won't catch up to him unless we're going all out. In fact, a fast revving V2 is just as fast 80% of the time, unless you're doing an outright drag race.
And by the way, power on the V4 is downtuned in 1st, 2nd and 3rd gear ... by that time you're pas 160kmph+ ... is that really the speed at which you're looking to improve your power gains ???
I do 3-4 track days/year and the rest is all road mix 30% city / 70% highway. I am very happy I spent on the S, and would do it again. Plus you get the gold suspension in the front just like your Bayliss ;-)
Now, with all that said, since you have the V2 Bayliss, with full Akra, then I wouldn't understand why you would do that trade. That Bayliss is cool, real cool, rides just as well, has 80% of similar acceleration and power most of the time, is fully equipped already, and has one of the two coolest upgrades you can get on a ducati, the FULL AKRA (the other being the Dry clutch, and you might not want that ... 1500 km to 5000 km life max before you replace the plates.). You have the better bike ... So in the end, why bother taking a hit ?
Just my 2 cents from my experience. Cheers !
P.S.: The streetfighter is great, but it is really a downgrade of 2/3rd in both power, agility, race capability. I have the SFV4S as well and it wiggles all over the road compared to the Pani. Again just my experience.