Back Splash Assistance

[Forrest Williams]

My back splash edges were not finished correctly, and I'm looking for some tips to clean them up. Right now they are grouted at a 45 degree angle on the edges, and while I was assured they would look good when they were done, they do not. What I'm wondering is if it would be possible to dremel behind some of the tiles, then insert a schluter strip. The problem areas are only about 14" tall, but in a noticeable spots. Any other suggestions for tiding up rough edges that doesn't involve ripping the whole thing out and redoing it?