You cannot use the grip adapter from the 2.0c on the 1.0c (15 or 17 round magazines). They have different frame/grip lengths.

As for the OP, I sanded mine down with a rough grit sandpaper (take the grip off so you don't damage the frame), particularly on both sides (the outer side tends to snag on clothing, so it needed it too). I went one direction - the direction my thumb travels (forward, I guess) when I grip the pistol. Think of it as trying to mimic the slide grooves/scales - one direction is smooth, and the other is grippy. This knocked down 90% of the texture, and then I took a steel "toothbrush" and kind of brushed the same direction I sanded to give it a little edging. I don't know if any of that makes sense, but it worked really well. YMMV.