Greg, I'm thinking the best way to cut that spot away would be just a straight cut across that section of the carrier film, removing just enough to get the offending spot off of there. It might even be advisable to use a fresh curved blade if you have one available (a #15 scalpel blade I think would be ideal), so you can just rock the blade on its curve so the paint underneath incurs the least amount of mechanical stress.
Getting the section of decal you want removed to separate from the surface can be done with a tiny blob of BluTack. Just hold the little blob of BluTack with tweezers and lightly dab at the edge of the area you want to pull away, and it should lift off pretty cleanly, even after Solvaset has been used. Had to use the BluTack technique a lot on the bottom of my F-4B to remove decals here and there that didn't belong on an older F-4B.
I can see all three of your photos, so you should be good to remove the other 2.