I used to use the WFT trimmer a long time ago. I had the exact same problem as you. The problem was the die I was using. I adjusted it using a headspace guage, and also adjusted the WFT trimmer. It was a pain to adjust the trimmer to make it trim 1.750. Also when using that type of trimmer DO NOT FORCE the brass into the trimmer. Use light downward pressure, twist and remove.
Delta Firearms Mfg Co. 07/08 FFL SOT 2, Hobby Shop Owner