The ISO-T is a a great driver in my opinion, but so is the KE4 TC adjustable. If you were to try the ISO-T, I would go with the 9.5 degree. However, because of what you stated about the face angle and challenges you have with a hook, of the two I think you have the most options in set up with the KE4 TC. The TC set to the lowest loft setting gets you to a 9 degree loft and square face angle. You can actually go one setting over and get 9.25 degree loft with about .25 degree open face angle. There are multiple options in the settings for you to try and you might find another setting that works depending on which shaft you choose.
With regards to shafts, of the ones you mentioned, I would rule out the Vista Pro because it is the most flexible of the S flexes and we don’t carry it in an X flex. Your clubhead speed indicates you can play a S or an X. Since you tend to hit it high, I would try the X to gain a little more stiffness to help control the trajectory. The Tensei Blue 60 is a little stiffer in the butt section and the mid section than the UST V2 Black X, but is slightly softer in the tip section. If you want to have a little more feel in the X flex you could go with the Tensei Blue. If you wanted a firmer feel, go with the V2 Black. Both are considered mid trajectory shafts and the X flexes in each are not super X flex. That is another reason I like them because they are not super stiff like some of the X flexes out their. If you decide you want to stay with the S, which is fine and would definitely feel less rigid but still firm, the V2 Black and the Vista Pro are almost identical in flex profile. The Tensei Blue 60 in the S flex is slightly stiffer. I would probably go with the Tensei Blue 60 if you wanted to stay with the S flex. Personally, with the 113-115 clubhead speed and the need to control the trajectory, I would try one of the X flexes.
Hope this helps.