I'm sorry to hear that.
I have tested every single hole in the plate, before posting it, and I dont have problem.
From my experience, about 5% of all bits I have are a bit tight, but I'm still able to put it in hole and get it out.
I did Flow Dynamics Calibration and it helped a bit. The bits fit in, but very tightly. Other projects are doing well. But I like your design the most. I will try to reduce the flow ratio.