Non Expert opinion here, if your SC Ratings aren't "Locked IN" per VA Regs, your kinda Screwed and I think you have (2) options. After you get the Award/Denial Letter, you could immediately file an "Official Request for a CUE Review" or be prepared to jump on the NOD Train right away.
You might be well served to discuss both options with a Very Senior VSO DRO Appeals Rep. An experienced trained eye, might be able to pick out a CUE issue to address. Could get your reduction unscrewed in as little as a couple months, worked recently for me, took 2 mos.
Do you see a VMC Phys Therapist on a regular basis? What do your most recent VA PT Dept ROM Clinician Notes indicate? I assume you filed for the SC Increase based on a Verified worsening of your back condition. What was your ROM evidence?
Just wanted to give anyone later reading this an update:
I was rated 70% on the 28th of September and then retro just hit this morning. (30th) Just wanted to thank all that have helped me and other veterans through this process. You truly do not know how much you have helped my family and others with this process. My two cents: Document, document, document! Keep everything and have all your ducks in a row before you file a claim. It makes it so much easier. I had also filed an intent to file claim before I formally requested an increase just to make sure I had all my documents together. Lastly, please do your research thoroughly before you file. It helps out tremendously. Again, thank you all!
So update they found everything service connected but at a 0% rating so I'm still 90% but yet there's a check going in for a huge amount and I downloaded my award letter and it still says 90% but a different monthly check amount that's more then what I was getting. The only smc is smc k1