Taking a file to get the grip to fit the weapon is way better than taking a file to make the weapon fit the grip!

What I always did was sand down and trim the fat between the two areas where the grip and weapon meet. Then I would take a 1/2" or larger drill bit and on slow speed drill little dimples in the grip material so that it wasnt smooth rubber! If you make shallow golf ball size dimples in it , it will help when your hands get sweaty and isnt as harsh on the hands as some checkering is.

I gotta start billing you by the post when you ask all these questions! HAHA!

Anywho.. Your tangodown grip is the one that has the storage compartment underneath right? I have never been a huge fan of those kind. I cracked one and never bought another. I usually just file down the hogues or put the cloth type grip tape on both the front and rear grips. Function over form on almost all the carbine forums. Alot of people like there tools to be clean and fancy. I care a little more about my 1911's than my carbines. I have gotten more dirt and grime in my ar's than I am sure anyone would care to.