Someone already replied to this, but this should clarify each point you've made:
-The FS Elevate/Elevate Tour are the 2020 updated versions of the previous Elevate/Elevate Tour from 2018 and 2019 respectively. FS stands for "flex stabilization" which is a ribbed carbon structure at certain points in the frame, in conjunction with the foam filling the racket already has. The FS Elevate Tour feels about the same as the OG one, but from what I've heard, the regular FS Elevate has a slightly smoother feel than the OG.
- This racket is a lot like a modern version of older Radicals, with the difference being that these are true 98"² where all the Radicals IG and before were 95"². But out of today's options, similar rackets would be the Head G360+ Radicals (MP and Pro), Wilson Blade 98 v7, Dunlop CX200, and maybe this new Prince Synergy 98; it could also be seen as a TF40 alternative with 16 mains and easier spin/depth. I wouldn't compare this to any of Babolat's 98's or an EZone/VCore 98 which are more modern and powerful; this racket has some free power but it's still lower-mid power like the other ones I mentioned. More powerful than the VCP, Prestige, and C10 Pro you mentioned, but less powerful than the PST with its almost tweener-like power level.
- The "tight 16x19" reference was me; I said that to try and explain how this 16x20 plays a little different than a typical 16x19. The extra cross does lower the launch angle slightly compared to most 16x19s and improves the directional control/predictability on most shots, even with the open mains, but those open mains let this racket produce some serious topspin, and the launch angle is pretty high on shots where you brush over the ball rather than hit through it. A tight 16x19 on a 95"² racket (like the CX200 Tour or Prestige Pro) or a 16x19 that's super dense in the center (like the Radicals this year) will be more precise/less spinny than this 16x20, but overall the 16x20 is somewhere between a typical 16x19 and a dense one in terms of control. If you have topspin stroke mechanics, launch angle will be slightly higher than a C10 Pro or VCP97 330. When you drive through the ball, launch angle should be more similar. Your Babolat PST string pattern is a lot like Pro Staffs/16x18 Phantoms where the mains are tight and crosses are open. The Elevate is the opposite of that: open mains, tight crosses.
-If you like solid weight and good feel the Elevate Tour or a weighted up regular Elevate is a great choice. The Tour comes with a 330 SW out of the box so it's got nice heft, and both Elevates have great feel, right up there with the Phantoms IMO. The only dampening agent they have is the foam filling ("impact shield") and neither Elevate is stiff, so these are super comfortable too. Sweet spot is large for 98"² racket on the Elevate Tour; with some lead at 3 and 9 the Elevate has an equally large sweet spot. Just to note, the Elevate Tour is 67RA unstrung (~64 strung) and the reg. Elevate is 64RA (~61 strung), so if you want a little more plushness, add some weight to the regular one, but if you want a little more crispness go for the Tour.