I got Publix brand shortening today and the trans fat is 2.5 per Tablespoon. Is this considered high ratio? I assume this is what Crisco was before they changed the recipe.

no, that's not considered high-ratio shortening. It's a generic brand of regular shortening. You probably cannot get high-ratio shortening at any grocery store, as far as I know. You will find it at cake supply stores or restaurant supply stores.

Two common high-ratio brands are Sweetex and Alpine.

High-ratio shortening has emulsifiers added to it. It absorbs more liquid and sugar and based on descriptions I've found, gives things a smoother, finer texture because of this.