Hmm...it looks like Jackson has two synchro style boots: the "Advanced Synchro" and the "Finesse". The Adv. Synchro is listed as "Strong Support" whereas the Finesse is listed as "Moderate Support". I'm not looking at the Synchro boot (the Elite would be WAY too much boot for me) but the Finesse.
Don't be too quick to reject the Synchro boot. I have those and I'm by no means a high-level skater (dancer at the equivalent of probably USA bronze level). Obviously you'll be guided by your coach, but I looked at the video you posted in another thread, and I'd be worried that the Finesse is too little boot for you - it's not very firm?
I wish I knew what Moderate/Strong/Firm (or Firm/Strong?) meant in relation to each other...
From the Jackson site:
Freestyle boot = 45 ("moderate")
Finesse = 45 ("moderate") - according to Kinzie's Closet. Jackson doesn't have the rating on its own site - not sure why.
The current Competitor boot/blade set is rated 55 ("firm"). I don't know whether you have the current model Competitor or the older one (you said your current boots were used when you got them) - I've been told that the older model was stronger than the current one.
Premiere boot = 65 ("firm")
Synchro = 70 ("strong")
Elite = 75 ("strong")
Elite Dance = 80 ("strong")
Elite Supreme can elect 69/80/90/95.
That puts the new Finesse boots as the equivalent of the Freestyle (in other words, lightweight skater doing beginner dance), and the Synchro boot as the rough equivalent of the Premiere. The Elite Dance is the equivalent of the Elite.