Darcy Scraps

I have owned three large format paper trimmers in my dozen or so years as a scrapper. I bought the Fiskars first. Hated it! Never could cut a straight line with the darn thing. I was so happy when CM brought out their version. I tried it, but it really wasn't what I was looking for. Finally, I found a Carl rotary trimmer. Heaven! It is easy to use and finally I had perfect, straight cuts. Notice I said HAD. I just can't make smaller cuts straight with my Carl. Anything snaller than 3 inches is a challenge. Help! Do I need a new paper trimmer?