Really I am trying to help...If I had not had mentors and people helping me learn thru life, things would be a lot harder
Oh man that got coved a little deep, and is going to require a lot of sanding. Put an edge guard on a Rotex with a hard pad and start at 80 grit. You are going to need to blend it well. If the edge guard allows the sander to get too close to the cove use an 1/8" strip of material with double stick tape on it. The outside round over also got cut a little deep. Easier to blend in though just use a soft pad, slow speeds and when pushing over the edge use a foam interference pad.
Another good thing to do is to "Fake in" the sharp outside corner. Meaning take sandpaper and by hand smooth it further. Using a sheet strip not backed, working it like buffing a shoe, will help keep the roundness.
Also run a router over the backsplash outer edge. You can even double stick tape something onto it cove it a little if that makes sense?
It will look great once sanded out