I always use black liner so sometimes I will use Carbon or Typographic. For a brown gel liner you could use something Matte and deep like Handwritten. I like the Matte2 formulas because they are super blendable.
Try using shadow with an angled brush like the 266. I feel like liquid and gel liners are too harsh on me also so I use shadow as liner instead. NARS's Night shadows like Night Flight or Night Clubbing are awesome as liner!
When I use black liquid liner, I always soften the line with Cover Girl e/s in Onyx. I think when you want to soften a harsh line, use a shadow one shade lighter to add softness...a thin shadow of the line
yup, I do that to make my liner look less harsh. I just use any color that's similar but lighter than my liner color to smudge it out. sometimes I just use whatever eyeshadow that I'm wearing on my lid and go over the liner. applying the liner before I do my eyeshadow works too at times