Ok apply your tape wherever you want it to be. The trick of the trade that I was taught years ago is this: as soon as your tape is in place, using an artists brush or just a soft bristle brush, apply clear lacquer, varnish, urethane/polyurethane. If by chance you can get yourself some clear high solids content 2 part A/B- Polyaspartic(Aliphatic Polyurea) whatever you decide on, brush it into the edge(s) of the tape where you want the crisp edge. Wait as long as it takes for the material to dry but not fully cure. Then paint your area and as soon as your done applying the paint, begin removing the tape, however, make sure that you peel the tape so that your pulling up and away from the area freshly painted, with the tape being removed, at an angle of about 45degrees. Do a practice one once and you’ll see how crisp of a long it makes.

Because from my experience when you use your method- the same color of paint as your wall, it still bleeds under the tape and even though it’s the same color you’ll still see it, you’ll see a shadow line there once it dries. the method I just described ,you won’t see anything like that and nothing can bleed under the tape because it’s sealed. It was a game changer in learning that trick from the man that taught it to me. It’s priceless in my opinion. I hope it helped somebody but be sure to pay it forward and teach others as well